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Okay Fact or Fiction...


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You have a stock car with a given air intake velocity and given exhaust backpressure.

*If you increase the intake velocity over stock and leave the exhaust the same(stock), you will create more back pressure, hence a drop in hp and torque.

*If you have stock air intake and new exhaust with less backpressure, you may lose some low end torque but gain some high end hp.

*NOW, if you increase air flow AND reduce backpressure by use of non stock intake box/filter and free-flow exhaust, would'nt it follow that you would have more hp and torque over the same rpm range as the original intake/exhaust setup???

Zat iz ze Qwezchun???

Looking for techinically astute replies based on experience and not old myth's. Thanks...

Bottom line, I am interested in BOTH reducing backpressure and increasing intake air flow with the objective of gaining more hp and torque over the same rpm range I have with the stock setup.... :help:

Edited by rockitman
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I think the answer is obviously yes.

As a proof point, you can look at the GT3 Cup. Same engine as your street car but it has a free flow air filter, no mufflers, and a different DME and it gets around 10 more HP. Of course, as a race car, they don't have to worry about noise laws or emissions.

Then you can look at the GT3 RSR. Same basic engine but with a totally different intake system, different cams, and no mufflers or cats. Around 420 HP.

So clearly there is more HP in the GT3 engine if you tune without the constraints of noise and emissions, plus not worrying about a 4 year warranty. However, I think the PAG engineers have probably gotten what they can out of the 3.6 while still keeping it legal and reliable.

Of course, there are lots of so-called tuners out there that will lighten your wallet with promises of 10, 20, or 30 more HP. If you are hell bent to go down that path, and you seem to be based on the questions you have posted on this and other boards, just ask for a money back guarantee based on dyno results before and after. See how quickly those big HP claims disappear.


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Very true Karl, it seems I am hell bent on improvements. I guess I would be happy with small hp gain(5hp), with improved sound and throttle response by going with free-er flower, perhaps fabspeed maxflow mufflers and a BMC free-flow filter or the GruppeM airbox with the enclosed cone filter. I do not see any warranty issues there and see a good possiblity of some improvements, albeit not much in the hp & torque department, which I am not too worried about. The wallet will take a little abuse...$1200 with BMC panel replacement filter and mufflers or $2700 if I go with mufflers and GruppeM intake box....hmmmm, what's a guy to do????

Thanks again for responding...I am now done trying to extract any more info in this area...Thanks for your patience.... :notworthy:

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