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Comp Cams Mutha Thumpr Cams (05-10 GT)

Item 30138
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      Review & Installation Video

      Hey, Justin with 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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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


      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

      Comp Cams 127020

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Camshafts

      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

      Customer Reviews (61)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 61 customers

      Installation Time: Full Day

      Installation Cost: $500-$1000

      • May 02, 2020

        5 2010 GT - NadineP Installation Time: Full Day


        Should be and must be professionally installed!! Got decent gain but the aggressive sound and rumble is amazing. Must have a tune. Also they are so powerful they sucked all the air away from my brakes had to get a brake vacuum kit installed. Extremely happy with this part!! A real head-turner....

        Helpful (0)
      • April 22, 2020

        5 2008 GT - RobertMcguire Installation Time: Afternoon


        If you wanna add power and a great old school Muscle car sound to your Mustang GT this is it! I had these installed and it was amazing! Then I paired these with a Muffler Delete exhaust and It's perfect! I have people pulling up to me asking what I've done to the exhaust and I tell them it's COMP CAMS BABY!! I'm so glad I decided on them! You will not be dissapointed!

        Helpful (5)
      • April 21, 2020

        5 2007 GT - JoshuaV Installation Time: Weekend

        Comp cams

        Installation was fairly easy took a couple of days at home. I would highly recommend gave the gave decent power and a beautiful exhaust tone

        Helpful (3)
      • August 04, 2019

        5 2010 GT - Terrance

        very good part

        bought these cams for the first phase of my build, they have a very good build quality cant wait to install.

        Helpful (4)
      • June 18, 2019

        4 2008 GT - TyroneL Installation Time: Weekend

        Great sound but..

        First these cams are great with borla atak and off road X-pype beautiful sound. Power wise its good for upper RPM range and that's about it. If you plan on drag racing your car I would look into different cams. Don't get me wrong with the right mods you can get them to work. Now If you have stock gears don't get these yet you need at least 3.73, I would recommend 4.10s. Because with stocks gears you will leave out the whole terrible. Also drivability with them are not so great without gears. Overall amazing cams for upper RPMs not so much for torque.

        Helpful (8)
      • May 06, 2019

        5 2005 GT - kentuckytrading Installation Time: Afternoon

        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....

        Helpful (6)
      • January 27, 2019

        5 2008 GT - TonyRacing Installation Time: Weekend

        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.

        Helpful (12)
      • December 03, 2018

        5 2006 GT - JasonK Installation Time: Full Day

        Let her scream

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

        Helpful (10)
      • October 23, 2018

        5 2008 GT - Brian Installation Time: Afternoon

        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.

        Helpful (15)
      • October 05, 2018

        4 2006 GT - RobertL Installation Time: Afternoon

        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

        Helpful (14)

      Questions & Answers (63 answers)

      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 (19)

      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 (12)

      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 (12) 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 (6)

      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
      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
      Is there any down said of getting comp cams mother thoumper 1 answer
      Can I run these with these with the stock catalytic converters installed or do I need to remove my catalytic converters? 1 answer
      I ordered these camshaft after calling and was told they are in stock and they are not. It says that they are still in stock 0 answer
      Is my 93 octane race tune that I had on the car before I bought these cams good enough for these cams or do I need a new tune 0 answer
      If I already have long tubes, a cold air intake, and a 93 octane tune, what kind of gains could I expect from a cam upgrade? 1 answer
      Will these cams also require the phaser bolts? 0 answer
      I have a predator 93 racer tune; will this work with it? 1 answer
      Do you have to use premium gas with this or would regular, 87, gas work. Premium gas expensive! 1 answer

      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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