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Originally Posted by 92TripleBlack
Correct. They do nothing. The "swirl" is all BS and snake oil. Intakes do next to nothing as well. We have an air pump. Its called a motor. The motor will only pump air as fast as its slowest point. The intake ain't it, nor the exhaust. What we need is a head job, cams, and a computer upgrade. Then the intake and exhaust start to make sense. The throttle body spacer for a Titan/Armada does serve one purpose: It makes the intake fit poorly.  |
I don't want to start a arguement, but it all depends on what vehicle you are talking about when it comes to intakes and exhausts. An exhaust on a truck can gain double digit HP. That is pretty significant IMO. Now i do agree with the comment on the head work, you would gain more if you had the heads done, but most intakes and exhausts are designed for the stock motor, not larger valves and ports, etc...
An example of intakes: for the 350z, no intake really creates more than 5-6 hp, and that is a stretch. The intake system on the 350z is already very efficient to the point where upgrading it DOES help, but not by much. A SVT cobra mustang however has double digit gains in HP and also gains 1lbs of boost according to a few magazine independant dynos. So it's all relative to the vehicle.
An intake and exhaust on the Titan/Armada do help fre up some power, and quite a bit at that.