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They were also going to the level of having these extra lips on the inside of the headers just after the motor to help cancel reversion
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reversion chambers, you will see them on REAL hytech headers.
Thing with N.A is you want the exhaust tuned to the engine pulses etc, basically harmonics etc. squeezing everything you can out of the motor.
Turbo, I say who cares, slamm that motor with boost and give it a big exhaust.
you can go too small on turbo cars(choking the motor) , but will a 4" loose power over a 3"?? maybe off boost it could yes (but who cares), but on boost maybe the same power.
So there is a point where going small COULD be better in certain circumstances.
If I already had a decent 2.5" system on a stock internal boosted honda I wouldn't be jumping at a 3" system tho