Quote:
Originally Posted by bofa
I think you are right in that it might not make sense for an inline 4. For a flat 4 though, I guess we'd have to see some tests. As for the output volume it would really depend on the diameter. If performance gains are realized for say, a 3" single pipe, it would be reasonable to expect similar or even better gains from a true dual with ~2" pipes.
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The Output volume doesn't depend on exhaust pipe..its the total exhaust volume that the engine puts out. Typically smaller engines don't give big exhaust pulses. Biggest you should ever go on a small engine, small displacement, N/A is a 2.5 in pipe...you can push 2.75 but your risking performance. A 3 inch exhaust will rape your low end torque band and ultimately rob you of power.