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Comp Cams Mutha Thumpr Cams (05-10 GT)

Market Price $806.99 You Save 12% ($94.02)
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$712.97 (pair)

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  • Item 30138
  • MPN# 127020

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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

    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?
    • Bullitt - 08, 09
    • GT - 05, 06, 07, 08, 09, 10

    Fits 2005-2010 4.6L Three Valve Mustangs Only

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    42 Questions / 12 Answers

    Ask a Question

    How much horespower gain will i notice with this?

    SawZaw08

    • 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!

      Sick06

    Show 2 more answers Helpful (7)

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

    NicholasW

    • 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.

      pserafi

    Helpful (1)

    Forced induction? Will these cams work well with a supercharger pushing over 8+ pounds of boost?

    KennyW

    • Not ideal... There are better blower cams out there.

      AutoXRacer

    Helpful (1)

    Would these cams work with an auto trans?

    Amkusdude

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

      jonnyc1906

    Show 2 more answers Helpful (1)

    Cams in everyday driver Can theses cams be used in a everyday driver without it being harsh on the motor

    Jake9107

    • No problem with everyday driving. Good drive ability. Good power.

      bybyls1

    Show 2 more answers Helpful (1)

    Although No Springs are Required, would there’s be any issues if I was to replace the springs anyways? My car has 160k Miles on it and I feel that I should replace the stock springs while I’m in there.

    Jose

    • With that many miles, we would highly recommend replacing the valve springs when installing these Comp Cams Muther-Thumpr Cams.

      AMJEFF

    Helpful (0)

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    Customer Reviews (41) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$500-$1000

    • Performance Gain 4.365854 4.4
    • Fit 4.902439 4.9



    • 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 (0)

    • 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 (0)

    • 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 (4)

    • 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 (1)

    • 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 (1)

    • 5/5

      Installation Time: Afternoon

      September 13, 2017

      Great cams

      Wow the feel and sound of these cams was worth the money spent. They sound amazing and feel great when u get into it

      JonS

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      September 01, 2017

      Makes the car jiggle

      Along with long tube headers minus cats, 373 rear end, and awesome tune, the cams made everything complete. Very satisfied. Awesome power. 345hp

      Lenora

      Year: 2007 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      June 22, 2017

      Amazing cam at an awesome cost

      These cams sound amazing and really wake the car up!!! They weren't hard to install at all. Make sure to get the cam phaser limiters as well. Great power, great sound and still able to drive it all the time.

      Jonesy

      Year: 2007 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      June 14, 2017

      WOW even if this is all I modded would be worth it

      These serious problems for me in my driveway, parking lots, garages, stop signs, traffic lights, "stop and go" traffic. And it's worth it, because the moment I'm above 2k rpm it is beautiful. I've learned to mitigate the issue I have below 2k rpm, no torque, stall issues. I embarrassed my wife by stalling 3x trying to park safely while taking her out to lunch. You can't go 20mph into a parking spot. Maybe once I finally finish my final upgrades and get a new tune it will be a sweetheart, that's ok, I wanted a beast and I have one.

      EricG

      Year: 2008 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Full Day

      June 13, 2017

      The thump you need in your life

      Combo these with any good exhaust and you will not be disappointed.

      AnthonyC

      Year: 2010 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      June 12, 2017

      08 sketchy vert turns heads

      I installed these cams myself. Very easy install and quality. However, I was not going for a lot of performance gain from this install. I was looking more for sound. I definitely got the sound. The car sounds pure nasty now. I couldn't have asked for anything more.

      cammd3v

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $1000+

      April 09, 2017

      Perfect

      They sound good and work perfect just what I needed

      Johnny

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 25, 2017

      Thumpr cams

      This cams sounds amazing! Just make sure if you get it installed you have money set aside for a decent tune or you're not gonna like them. I went about a week without a tune and the car bounced around like it was on a dirt bike track until I got the tune. Other than that these cams are awesome and I've gotten a lot of compliments! Great job AM!

      HaroldK

      Year: 2006 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Afternoon

      March 15, 2017

      Great sound, great gains!

      I put these in my 2006 GT and got great results. Install only took me 3.5 hours, but you definitely come out better with a buddy in a ship then in your garage if it's avaliable to you. This plus a Bama tune got me gains of 35 hp and 45 torque! Great product, worth every penny.

      BradleyI

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 15, 2017

      Muscle car sound

      The comp "muthr thumpr" cams really made a,huge difference in not I my sound but performance as well. I love the lopey old muscle car sound and it turns heads everywhere. Thanks American Muscle

      ChrisW

      Year: 2009 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 14, 2017

      Have no tune yet

      Sound great but haven't really got into it causes I have no tune for it yet

      Stepphon

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      November 22, 2016

      Shake Rattle and Roll!!!

      Had these cams and phase limiters installed last week and what a beast it has created! Great thumping idle for that hot rod sound. Drive-ability does suffer if you are planning for a daily driver. Low RPM range is not its sweet spot if stuck in traffic with lots of starts and stops with 5 speed needs to get moving, auto might be better not sure. Fuel mileage drops quite a bit as well.

      RickBr1

      Year: 2005 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      May 26, 2016

      Amazing sound!!!

      I listened to a lot of videos on YouTube before and while I waited for the mother thumpr cams to arrive. I couldn't get over the sound difference in the videos. But that first time you fire it up and hear it you will smile ear to ear like the grinch that stole Christmas. Comp cams makes an amazing product and they do exactly as expected. You get a good little boost in performance as well as that nasty old school thump.

      Deuce

      Year: 2005 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      May 14, 2016

      One of the best upgrades!

      I wasn't sure I should buy these or save some money and get the hot rod Cams but I am glad I picked these. I have longtubes, an off-road H pipe, and Borla Stingers and with these cams it has to be one of the meanest sounding cars I have ever heard. Not only does it give a nasty lopey idle but the volume increased significantly as well. I never did a cam swap before but I managed to finish the job in one day and tuned it with the Bama tune and it runs great. You need to buy or rent the timing chain wedge, spring compressor, valve train assembly lube from Comp, and a torque wrench that measures in inch pounds and ft lbs, some black gasket sealer, a T25 torx head socket, and a set of basic hand tools to get the job done. As long as you follow the instructions and are very careful about keeping the inside of the heads and valve train components clean you shouldnt have any problems. I definitely recommend these they just sound amazing.

      TB19

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 02, 2016

      Comp Cams, What a sound

      great sound and definitely feel the power gain. need patients for first time install.

      Dave

      Year: 2005 Submodel: GT

      Helpful (0)

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