|
I would recommend not going anything larger. On my '05 Toyota Corolla A/T, i had an aftermarket 4-1 header, 1.25" custom exhaust piping from the cat, and an aftermarket muffler installed a few years ago. At the time i did all that, i wasn't really keeping track of gas mileage. A few months ago i switched back to the stock muffler/piping and exhaust manifold and f/e actually went up.
|