|
For NA engines, going to a diameter that is too large will reduce flow velocity and reduce power. Getting the highest-flowing cat and muffler you can find for your stock size is your best bet.
My Tempo has a 2 inch system, but the stock muffler had a 1 3/4" outlet. Changed it out and immediately noted an improvement in power on the high end.
For gas-miserly driving, you're not really going to go into the RPM range to take advantage of higher-flow exhausts.
__________________
In Reason we Trust
|