what one really wants to have is the front tip of the pipe to be as wider as possible (think wisely) while the other end of the pipe to be close to the width of the intake manifold. This is basic fluid mechanics. A more general treatment would require considering the effects of turbulence in this co...
Well, sax's car is way less louder right now however i used to like it the way it sounded before.
In fact, you could easily be fooled by its awesome sound since it gave you the impression the sound was coming out of a much faster car.
For a force-fed application, runner design is less of a factor than for a N/A design. Plenum volume is the key---the rule of thumb is plenum volume >= engine volume when force-fed. A large plenum has a few draw backs though so it is not the magic bullit either. A large plenum breathing through a si...