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Comp Cams Mutha Thumpr Cams (05-10 GT)

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Market Price $758.99 You Save 5% ($39.00)
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$719.99 (pair)

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  • Item 30138

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    Features, Video & Details

    • Very Rough Muscle Car Idle
    • Biggest Cam Available for Stock Heads
    • Great Power Above 4900 Rpm
    • No Springs Required ("NSR") - Compatible W/Stock Valve Springs
    • Fits 2005-2010 4.6L GT and Bullitt

    Review & Installation Video

    Review & Install Video

    Hey, Justin with AmericanMuscle.com here, taking a closer look at the Comp Cams Mutha Thumpr Camshafts available for the 3-valve motor found in all 2005 to 2010 Mustang GTs. A set of new cams for your 4.6L is just one of many different ways to pull more power out of your 3-valve motor. Now if you're looking for more ways to increase the horsepower and torque in your Mustang, go ahead and click on the link below to subscribe to our YouTube channel or you can check out many of our different builds, including one very nasty 3-valve named Project Grabber Boost. Comp is one of those names that just about every Mustang fan should be familiar with. They've been producing quality camshafts and valve train components for over 35 years, making them one of the best in the biz. The Thumpr series camshafts are just one of many different cams offered by Comp and will give your GT a serious hot rod idle thanks to long exhaust duration along with some nice performance gains without having to replace your stock valve springs or retainers. In fact, Comp says that the Mutha Thumpr here is the largest cam they offer for the stock heads that will give you some nice performance gains throughout the entire power band but they really shine above 4900 RPM. In fact, go ahead and click on that link below to check out some of the customer reviews about these camshafts. While you're there, you can actually check out a video that one of our customer's link to his own ride, which will give you a good sense of how your idle will be with these cams in your 4.6. I do want to point out that, in addition to the cams themselves, you will need to pick up Comp's Cam Phaser Limiter kit, which is available from a drop down tab located on the product page. This allows your motor to still retain the use of its variable valve timing but will limit the total cam timing to prevent any piston to valve contact since the 3-valve is an interference motor. In addition to the Cam Phaser Limiter kit, of course you will need it custom-tuned, which is available from the bandwidth performance team. Installing a new set of cams along with the limiter kit is a job that should ultimately be left up to your local mechanic or speed shop due to the complexity of the work. On the other hand, if you're the type of person that likes to tackle any and everything with your ride, then go ahead and leave yourself about a full-day in the garage to get the job done. If you should have any questions about the install or about the Comp cams in general, you guys should know what to do by now. Hit us up with our 800 number or feel free to write us an email. If you've been looking to cam your three-valve and you wanna run the biggest possible cam with the stock heads, valve spring or retainers still in place, look no further than Comp Cams Mutha Thumpr Camshafts available right here at AmericanMuscle.com.

    Mutha Thumpr. Comp Cams Mutha Thumpr Camshafts really live up to their name. These are the largest aftermarket camshafts you can run with the stock heads. These Comp Cams produce great power gains over 4900 RPM's with a very rough muscle car idle.

    No Springs Required. These cams are compatible with your stock valve springs, so there's no need to remove and replace your 24 stock springs, saving you time and money.

    Application. Comp Cams Mutha Thumpr Camshafts are sold as a pair for your 2005 to 2010 3V 4.6L modular powered Mustang, including both the GT and Bullitt models.

    Technical Note. The installation of these Comp Cams will require a phaser limiter kit and custom ECU programming.

    Fitment: 2005 2006 2007 2008 2009 2010 Details

    MPN# 127020

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (2) Camshafts
    Installation Info
    Tech Specs
    Comp Cam Data Sheet
    Part Number: 127020 Grind Number: MT273LL
    RPM Range: 750 to 6600 Engine Type: FORD 4.6 and 5.4 SOHC MODULAR 3-V
    Lobe Sep Angle: 109

    Intake Exhaust
    Duration: 273 306
    Duration @ .050" Lift: 234 254
    Valve Lift: 0.45 0.45
    Will it fit my Mustang?

      Customer Photos (10) Submit Your Photo

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        Questions & Answers (57)

        5 Top Rated Questions

        Can these be put in an 06 Stage 3 supercharged Roush?

        • This set of cams by Comp Cams would work on any 2005-2010 Mustang GT, even if it is supercharged. However, I'd recommend talking to a tuner or engine builder to pick out a good cam for your application since a large cam isn't always the best option for forced induction.

        Helpful (18)

        any one knows how many horse power gives these cams compared with de Ford Racing ones? wich of them gives the improved performance from lower RPMs? what about the gasolines consumption using each one ?... or just the big difference is mostly the iddle sound ?

        • The biggest difference between the Comp Cams Cams and the Ford Performance hot rod cams will be the sound yes. However overall the Ford Performance cams are known to push a little more power than the Comp cams will.

        Helpful (10)

        How much horespower gain will i notice with this?

        • I have these cams put on with a full exhaust, in order to get the real feel of these cams you need to have long tube headers, an X pipe or H pipe of some sort as well as axlebacks. It's a huge difference compared to the stock cams, so you'll be looking at real horse power gains with supporting mods of about 30 RWHP, which is alot more than you think it is!

        Helpful (10) Show 2 more answers

        What would be the best tuner to buy for the custom tune???

        • We recommend the Bama X4/SF4 Power Flash Tuner or the Bama Rev-X Tuner by SCT for use with the Comp Cams.

        Helpful (4)

        Would these cams work with an auto trans?

        • Yes. I have them in my 06 with an automatic trans. But I would recomend a 3000 stall converter.

        Helpful (4) Show 2 more answers
        Post Your Question
        10 More Questions
        Forced induction? Will these cams work well with a supercharger pushing over 8+ pounds of boost? 1 answer
        Cams in everyday driver Can theses cams be used in a everyday driver without it being harsh on the motor 3 answers
        Does anyone know if these cams will affect Colorado emissions? 1 answer
        I love my new cams had them put in at Houston performance we put in a stc tune JLT cold air and when I turned on the ac it would die when I would stop at a light went back put in new tune drove 37 mile got on it in 1st 2nd and 3rd ran great then ck eng light came on still runs great is this common to have to tune this much to get it right making 308 hp and 328 pounds on dyno 0 answer
        Is there any down said of getting comp cams mother thoumper 1 answer
        will the performance v2 bama tune work for these cams 1 answer
        Is it a must to install the cam phaser limiter with this? I saw a video on You Tube and all they did is install the cams but not the limiter, thanks. 0 answer
        What is required for installation on the 2010 4.6? 1 answer
        Can I install this on a stock 06 mustang gt it only has a k N intake 1 answer
        Ive got a 4.6l engine that im sending in to be rebuilt and put 30 over since im already rebuilding the whole engine should I upgrade the springs with the cams? 1 answer

          Customer Reviews (56) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$500-$1000

          • Performance Gain 4.446429 4.4
          • Fit 4.910714 4.9



          • 5/5

            Installation Time: Afternoon

            May 06, 2019

            Be ready

            This mod turns a car you drove into a driver. Need a tuner after installation, beautiful exhaust note but must have rear gears and converter change on auto would be nice. Otherwise you’re playing with the shifter and OD button under 55. Headers and CAI, of course. Cam loves 2000 rpm up. Under 2000 she is lagging badly and exhaust drone will wear you out. At a stoplight everyone hears this mod..... Everyone. Put your foot in it and from 4000 up you hear heaven....

            kentuckytrading

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Weekend

            January 27, 2019

            Cams for a sport Trac?

            I ordered the comp cams stage 1 for a 08 mustang, BUT i installed in my 2007 Sport Trac 4.6L 3 valve like many other parts that i ordered from American Muscle, before I installed the cams i dyno the truck and did 258hp and 265 tq, after install the cams i drone the truck to the dyno (yes, you can drive the car after you install the cams, is safe) and did 286hp and 295 tq on the wheel, i gain 28 hp and 30 tq, i recommend these cams, these are not the only parts that you can use from a mustang to your 4.6L sport Trac, there are many interchangeable parts that you can use for your 4.6L sport Trac.

            TonyRacing

            Year: 2008 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            December 03, 2018

            Let her scream

            Now i can at least keep up with the new stangs and even beat the newer challengers and camaros

            JasonK

            Year: 2006 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            October 23, 2018

            Great cams!

            These cams are everything I’ve wanted! The drivablility after the tune is awesome And it pulls so much harder above 4,000! Took me about 3 hours to install in my garage with basic hand tools and torque wrenches.

            Brian

            Year: 2008 Submodel: GT

            Helpful (7)

          • 4/5

            Installation Time: Afternoon

            October 05, 2018

            Good mod.

            Put these in last winter, first few times out (1/8 mile drag racing), the cams felt good on the big end but VERY flat out of the hole! (2006 Mustang GT with 5R55S automatic). added 4.10 gears and a 3500 rpm stall converter and the car came alive. Actual gains, cut a full second off my 1/8 mile E.T. Cams are great alone if all you want is sound, but real gains in performance come with the normal supporting upgrades. Current mods are the cams, 3500 rpm TCI Stall Converter, 4.10 Motive Gear gears, BBK long tube ceramic headers, BBK off-road x-pipe, Steeda CAI, Cherry Bomb single chamber mufflers, and a pair of Racestar 15"X10" rear wheels with 275/60-15 MT ET Street Radial Pros

            RobertL

            Year: 2006 Submodel: GT

            Helpful (6)

          • 3/5

            October 04, 2018

            Just got mine in wiyh 3 day shipping

            Very happy i got them in 30 mins ago and cheapest price on the internet right now its hard not to buy them, i am a little salty that i recived one with a nasty hit in the comp box (not shipping) that even tore the plastic covering the cams inside the box i wish they would inspect before shipping but cams seem to be okay.

            Dayne

            Year: 2008 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            August 09, 2018

            Nice

            Love the lone they put out and good #s above 4000 rpm

            Tank

            Year: 2006 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Afternoon

            July 30, 2018

            AMAZING SOUND AND POWER

            First of all we did it in 4hours with moderate experience but this was our first attempt in the valve train. I get compliments everywhere I go, and now the car seems to keep pulling all the way to redline!

            TylerG

            Year: 2007 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            May 29, 2018

            Gotta love a big cam!!

            Installation was straight forward and not to hard. You will need the timing chain wedge and make double sure it is lined up before you push it in to place. I made the mistake and believe me you don't want to. Basic hand tools and torque wrenches are needed. Had to improvise with the phaser springs and manually unwrap the spring, install the limiter and then re-wrap the spring. Sounds scary but it wasn't that bad. Cams sound awesome, everyone can't get enough of hearing them. I haven't stopped grinning since putting them in. Why are you hesitating? Order them today!

            David

            Year: 2009 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            May 13, 2018

            Lives up to its name

            Bought these awhile ago and finally got them installed. These cams provide an amazing sound. I have straight pipes with long tube headers and high flow cats and I thought my mustang was loud. After putting these in, my mustang was so much louder, with a much better sound. It’s a bit harder to drive in the lower rpm range and my mpg dropped like a lead balloon but it is 100 worth it. Highly recommend these cams if you’re looking for that muscle car sound.

            MichaelS

            Year: 2010 Submodel: GT

            Helpful (7)

          • 5/5

            April 17, 2018

            Cam for my Stang

            The cams are awesome they sound great ,I installed them and the phase limiters . Was fairly easy but I have lots of experience and the tools . I installed the lock out tool on the phase limiter before removing them. Thanks American Muscle and Com Cam .

            Dutchy55

            Year: 2005 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            April 07, 2018

            Comp cams

            Old school sound. I love it!!!!!!!! It took a full day to install but it was totally worth it !!!!! it will need a tune to regulate the engine! But other than that i couldnt be anymore happier!! Increase in power and sound

            NelsonP

            Year: 2007 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            April 05, 2018

            Thumper Cams

            Had Ford performance shop install these cams. They sound wonderful!!! Recommend having shop do this job. If over 100000 miles have the phasers replaced as well. Ran into some issues with old phasers. Haven't had Dyno yet for hp gains but the sound alone is fenomonal!!

            DavidO

            Year: 2005 Submodel: GT

            Helpful (10)

          • 5/5

            Installation Time: Full Day

            March 23, 2018

            Great as always.

            Great product, fast shipping. Decent install time. Haven't done a pull yet but hopeing for good power.

            StephenN

            Year: 2006 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            March 12, 2018

            My 06 hot rod

            The cam sound great it gets up and go .Open up the cutouts it reel sounds like a Best

            MikeL

            Year: 2006 Submodel: GT

            Helpful (5)

          • 5/5

            February 17, 2018

            Kim Ritchie

            Looks like good quality. I'm still compiling a few more performance parts and then install everything all at the same time. Thanks American Muscle for the availability of good performance parts and the great delivery.

            KimR

            Year: 2005 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            November 23, 2017

            06 GT

            These cams are loud and made the car a different car all together. But a warning, you will loose your bottom end torque without installing a torque converter.

            JamesC

            Year: 2006 Submodel: GT

            Helpful (9)

          • 4/5

            Installation Time: Afternoon

            November 17, 2017

            Good Cams Nice sound!!!

            These cams are big cams and sound like big cams and there awsome great power and sound and alot of power on the higherend. Yes i said higherend you will most likely feel a little bit of power lose off the line if your runing stock 3.31 gears as i figured when i got them. But that said i do suggest you buy a set of gears to get you into the powerband faster and make up for that and improve your gains and fix that problem maby grab a set of 4.10/3.73. Another thing is that there SuperLoud if your like me and Run no Cats and offroad X then be prepare to rattle the windows out of your house but who doesnt love that :D

            ScottieB

            Year: 2006 Submodel: GT

            Helpful (15)

          • 5/5

            Installation Time: Afternoon

            November 02, 2017

            Thumpr Cams 2007 Mustang GT

            Love these cams, shake the ground at idle. I'm running Magnaflow mufflers with a off road x pipe. Still able to run highway speeds and be able to hold a conversation in the car. Mileage is 15.5 in town and believe it or not 26.5 on the interstate. We do a lot of stop and go driving while in Charleston, SC so the mileage could be better in town depending on where you live. I may go with a set of 3.55 gears though as when the car gets into the lope range of the cams 750 -1200 the car tends to chug/lope in gear.

            ZacharyW

            Year: 2007 Submodel: GT

            Helpful (11)

          • 5/5

            October 20, 2017

            Really great cams! Read this review!

            These cams are awesome! Sounds totally beast like! My car runs perfectly fine with no driveability problems(my car is an automatic).However, I can see why at least a 3.73 gears setup is recommended (but honestly get 4.10s) because your power band is going to be slightly delayed in the low rpms. Honestly though it’s fine. I had these cams put on with stock exhaust (my car has over 117,000 miles) and just take my word for it, don’t expect to see optimal gains with your stock cats. So I went back to the speed shop and got a an X-pipe with high-flow cats and runs like mad now. You’ll love these cams they’ll rock your mustang literally!

            Encino

            Year: 2005 Submodel: GT

            Helpful (12)

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