WIN $5,000 For Your Mustang! Enter Now
Talk to a Mustang Expert
1-888-332-7930
Mon-Thu 8:30a-11p, Fri-Sun 8:30a-9p

Free Shipping - Get it by Dec. 24th available on most items - Details

Comp Cams Mutha Thumpr Cams (05-10 GT)

Market Price $855.99 You Save 17% ($143.02)

$712.97 (pair)

FREE Shipping
  • Item 30138
  • MPN# 127020

In Stock Ships same business day. Choose options to add to cart

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

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

Most Helpful Reviews

5/5
GREAT CAMS

Great lope, really gives the car that sound of an old school hot rod. Felt the power gain right away, great bang for your buck. Had my shop do the install, took 7 hours to install, paid $700 for the install. ...

Read More
Helpful (1)

5/5
Great set of cams!

I purchased these cams with the FRPP intake manifold and I gotta say, the car sounds and performs fantastic now that they're running a little smoother with everything and the tune is getting dialed in. ...

Read More
Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 25 Reviews

Customer Photos (6) Submit Your Photo

View All 6 Photos

You Might Also Like

18 Questions / 9 Answers

Ask a Question

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

    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

Will These Hurt or Help a Boosted Setup? I have a 2010 4.6 with a Kenne Bell supercharger. Puts down 495 whp and 445ft/lbs. I want the cams mainly for the lopey idle, and can't afford any HP gains (on stock internals). Can I install these cams for more show than go? If that makes sense.

Orionstang

  • I would be wary of that change. The cams change the inflow and outflow of air which will require a new tune. When I replaced my stock cams for Ford Racing cams it required a whole new Dyno tune to have a viable resting idle as well as an appropriate intake and outflow recalibration. The part itself isn't expensive but the new Dyno tune sure was. I didn't see a big gain. You will get a rough idle and an interesting shake with your car as well if you are into that kind of thing. Good Luck!!

    ChuckDO

    Good Answer (1) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

would this work on a supercharger say at 10psi

jay600

  • It will work, but not ideal if you want to make power. Look for a blower specific cam.

    AutoXRacer

    Good Answer (1) (0)

Answer This Question I need this answered (0) (0)

What kind of gas mileage can I expect with these?

dmurphey

  • With my tune not 100% dialed in, I've been getting 14-15mpg city ( if I go easy ) but it's easy to dip down into the 12's in fuel economy. Highway I can get around 22. Before I was getting 17-17 city and 28-30 highway. I also have full exhaust with long tubes, a catted X-pipe and 3.73 rear gears. I have hear dog people doing much better than I am with fuel economy but I think it relies heavily on your foot and the quality of the tune.

    grabberbluemach

    Good Answer (0) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

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

    Good Answer (10) (1)

Show 2 more answers Question Resolved

I was talking to a mechanic and he said that these cams cause normal vacuum pressure from the engine to be reduced, but that the brakes system feeds off of the vacuum. Has anyone noticed a change in their brakes after installing these? Is there a way to remedy the problem?

Delta3835

Answer This Question I need this answered (0) (0)

More Products You Might Like

Customer Reviews (25) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$500-$1000

  • Performance Gain 4.28 4.3
  • Fit 4.84 4.8



  • 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 (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 19, 2015

    Amazing sound

    Cams fit no problem, phaser kit was easy to install once we figured out how to get them apart. Awesome sound at idle little loss of power off the line (lag). Overall happy I chose these cams over the others.

    doubleAs

    Year: 2010 Submodel: GT Milton, WA

    Helpful (1) (0)

  • 5/5

    Installation Time: Weekend

    August 05, 2014

    Great set of cams!

    I purchased these cams with the FRPP intake manifold and I gotta say, the car sounds and performs fantastic now that they're running a little smoother with everything and the tune is getting dialed in. I did all the installs myself ( also installed the required Comp Phaser limited kit and new Phaser bolts that are both available from American Muscle ) The install wasn't TOO bad and I had never tackled anything that intensive on an engine before ( let alone on my daily driver ) and even though the install wasn't the worst thing to do, I think the peace of mind alone is worth the price of paying an experienced shop to do the install for you. Everything ended up fine in my case, but I can see how that could have ended very badly and you have no one else to blame but yourself haha Some other things you will need to complete this install if you're feeling brave and adventurous is a timing chain wedge and a bottle of cam assembly lube. American Muscle does not sell a timing chain wedge and the cheapest I could find one was from Freedom racing. And the lube can be purchased at any auto parts store. Other than that, you don't need to spend the money on a valve spring compressor. Just loosen the bolts on the cam caps one at a time working from the inside out to relieve valve spring pressure. Leave the roller followers in place when you remove the stock cams. But yeah, great cams, and great service from AM as always!

    grabberbluemach

    Year: 2010 Submodel: GT Pontiac, MI, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    July 28, 2014

    GREAT CAMS

    Great lope, really gives the car that sound of an old school hot rod. Felt the power gain right away, great bang for your buck. Had my shop do the install, took 7 hours to install, paid $700 for the install. And since you don't have to get new springs, you save even more money, a win, win situation. If you're looking for a great lope sound at idle than I highly recommend these Motha Thumpr cams.

    Aztecarex

    Year: 2005 Submodel: GT Austin, TX, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 23, 2013

    WOW

    I have purchased these cams TWICE! I bought them and loved them enough to make them my first serious mod on my newest mustang.You will never ever regret doing business with American Muscle. They have taken exceptional care of me and treated me very fairly.

    SpencerN

    Year: 2006 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    January 10, 2012

    Monster Sound!!!!!

    My local speed shop suggested these cams to me when I was serious about upgrading. At first I was a little disappointed when I realized I would have to buy the additional component (Phaser Limiter Kit) and some new camshaft bearings. I must say though, I am VERY pleased I went with these over the traditional Ford Racing cams. These may not be a direct fit like the Ford Racing cams are, but they are bigger cams with a sick sound to them and they increased my horsepower BIG TIME. My stang is now a beast thanks to these cams!!!

    2006GT

    Year: 2006 Submodel: GT South East Texas

    Helpful (13) (0)

  • 5/5

    Installation Time: Full Day

    August 13, 2012

    Comp Cams breakdown.

    These cams are amazing!! They are a must for anyone looking for that extra power they are looking for in their S197. These cams have to have to meanest muscle car sound I have ever heard, i have got so many comments on this product that I'm starting to get annoyed! (In a good way) I had already put a full exhaust on my car so the outcome along with an offroad x pipe and catbacks make this thing sound so much more mean than it is! I would recommend this product to anyone looking for any HP gains what so ever. Thanks AM for making it easier to have a good time!

    Sick06

    Year: 2006 Submodel: GT Kentucky

    Helpful (7) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    July 28, 2012

    these cams are the way to go!

    I had these cams installed and absolutely love them, particularly when I pull in and leave car shows. Everybody is looking around to see where the camming hot rod is coming from and realize it is a newer mustang. I can't leave without getting stopped with questions and admiration. If you want to be the unique mustang at a show or just cruising around, these cams are the only way to go, believe me, I shopped around for a long time and I know I made the right decision. http://www.youtube.com/watch?v=c0Wz_ZE4Igs

    garya

    Year: 2008 Submodel: GT oregon

    Helpful (13) (4)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 30, 2013

    Outstanding performance with supporting mods

    I just had these installed with 410 gears in my 08 GT and all I can say is WOW!! I can't say exactly what these cams gave me in horsepower numbers as I already had Pypes LT headers and ORX pipe, JBA axle back and Air Raid CAI installed when cam install was done. After dyno tune was complete, the car put down 363.94 rwhp and 342 torque at 6500 rpms. And did I mention that nasty lopey idle? Absolutely amazing!!! I Highly recommend these cams. And as always, AM came through again with very fast shipping.

    heavyfooted

    Year: 2008 Submodel: GT Newton, NJ, USA

    Helpful (5) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 25, 2012

    Comp Mother Thumper Cams

    These cams sound great and give the engine a whole new sound. I have enjoyed them so far!

    Jeff08

    Year: 2008 Submodel: GT Maryland

    Helpful (5) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    June 29, 2012

    Great old school sound

    Very happy with this install. Great sound, great performance. Gave my 05 that great old school sound. I've had lots of compliments. Very glad I decided to get this mod. Would recommend this product to anyone thats looking for a great sound and increased performance. I give it a +A.

    Chuck22

    Year: 2005 Submodel: GT Muscle Shoals, AL, USA

    Helpful (6) (1)

  • 5/5

    Installation Time: Afternoon

    April 02, 2013

    CAMMER LH

    CAMS ARE FAIRLY EASY TO INSTALL. THE PHASERS ARE A LITTLE TRICKY. THE SOUND WITH THE PYPES SHORTY HEADERS,X PIPE,AND VIOLATER MUFFLERS IS BETTER THAN I ANTICIPATED.NOTICED POWER INCREASE. OVER ALL GREAT PRODUCT.HIGHLY RECOMMENDED.

    FOURJ

    Year: 2008 Submodel: GT MANY,LA

    Helpful (3) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    April 19, 2013

    great choppy sound

    i only have stock exhaust anf a set of flowmasters outlaws axle backs installed with these cam and the car sounds amazing it sounds mean but isnt so loud u cant talk standing around it great buy for the money

    bigjohn420

    Year: 2007 Submodel: GT Gainesville, FL, USA

    Helpful (4) (1)

  • 5/5

    Installation Time: Shop Install

    January 19, 2014

    Amazing sound that will turn heads

    I got these cams put in last week. I have moved, so i couldn't do it myself so I had a shop do it. Besides the ford shop messing up and have to have my car there two days these cams are amazing. I have a Bama tune with these cams and it ties it all together. Make sure if you buy these cams you get the phaser kit and two cam bolts, the bolts only come one at a time so make sure you get two. After It was all done, the whole shop came over to check out the sound. It sounds like a cammed out muscle car now and really sets my mustang apart. I would strongly recommend these cams from AM.

    tleadbeater88

    Year: 2008 Submodel: GT St. Johnsbury, VT, USA/Seatte

    Helpful (2) (0)

  • 5/5

    Installation Time: Full Day

    October 22, 2014

    Thumpn down the road

    I already had the Ford Racing "Hot Rod" cams in my Mustang, but I wanted more thump. I knew the Comp cams were only a little bit more that my Hot Rod cams, but I wanted to try them anyways. The Hot Rod cams are awesome, lumpy with great power, but the Comp cams changed everything. More power on the top end (which I knew) and hit's later (rpms), the only benefit is the huge cam lobe at idle. Would I switch back???, no way...you can't beat the way everybody's heads turn when you drive up.

    APKG4U

    Year: 2008 Submodel: GT Rathdrum, ID, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    June 13, 2013

    Good Power, Awesome Sound

    First the good: Fantastic sound either at idle or at full throttle. It will turn heads and people will give you the thumps up everywhere. Power increase is decent, but for max results install CAI, Motion Delete Plates, Headers, and exhaust. My results with all this was 350 RWHP / 338 RWTQ with an aggressive tune. You will see about 300-315 RWHP with no other mods but you still need a tune. The Bad: The car will sound great outside, but it may be a bit much for some people, especially if you drive it everyday. Since the build quality of these cars is not the best, you will hear more creeks and squeaks. You need to have at minimum a 3:73 Rear End Gear or car will buck or stall. You will be riding the gas constantly to get into gear. With an auto it may be different but mine is a manual. Fuel Econ goes down significantly, but you are probably not worried if you are getting these anyway. Overall I am very happy with them and AM had great delivery and service!

    stang281

    Year: 2006 Submodel: GT Chicago, IL

    Helpful (1) (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    April 19, 2013

    they have good performance and awesome sound.

    The cams perform great. I gained 28 hp. But they were installed with a couple other bolt on mods so im not 100% sure of what the hp gain on the cams alone was. I gained a lot of mid range and top in power for sure tho. I did loose a little low in power. But the old school muscle car sound stops everyone in their tracks. I added a 3000 stall converter and together they're awesome. If you like muscle car sound and power I wouldn't think twice about these cams.

    jonnyc1906

    Year: 2006 Submodel: GT Little Rock, AR, USA

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    May 30, 2012

    My cam review

    The cams sound great in my mustang with the few intake mods i had already done. if you are a beginer to the mod world these cams are a really good way to start adding power to you mustang.

    venompony06

    Year: 2006 Submodel: GT Elgin IL

    Helpful (4) (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) (1)

  • 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) (1)

Related Mustang Categories