Installed IPD Intake Plenum on 986 Boxster...Pics & Review

[Johnny Danger]

Originally Posted by Lobo1186

from what I understand one of the many disadvantages to some aftermarket exhaust setups is that the free flowing exhaust causes a drop in back pressure. Which in turn can rob low end torque.

My question is if allowing more intake will counter act the free flowing exhaust from an aftermarket system. I suppose like balancing an equation.

Of course it may not work like that at all. That's is why its more of a question.

The major problem with the oem exhaust system, is that it is very restrictive. Therefore, by eliminating some of these restrictive components in favor of some of the better designed aftermarket products, one can effectively increase flow. I hasten to say, however, that at some point it becomes a delicate balance between creating a less restrictive exhaust system that increases power commensurately versus one that is too free flowing and consequently loses power by eliminately the necessary degree of back pressure. In my experience, the latter of the two has almost always resulted in a loss of low end to mid range torque.

[stephen wilson]

In addition, there is much more to intake/exhaust tuning than just the restriction or backpressure. The exhaust pulse pressure waves can be tuned just like a musical instrument or subwoofer port. Whole books are written on the subject.