| I'm usually on the bigger is better after the turbo for the exhaust. However, I had a book from the library late last year I read through about performance tuning FI engines and there were things to be gained from a properly sized exhaust system all the way to the muffler including having the correct diameter meant better spool etc. To actually have those gains though you had to have it all pretty much spot on which means a full custom exhaust. 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.
So yes it can give better spool etc, but it'd be marginal and would have to be thoroughly designed. |