What size piping should i do? i am going to do a dual exhaust with some new flowmaster mufflers but i don't know if i should use the stock piping or go bigger? Can anyone help? i guess i should add i have a 07 se.
It sounds like you have an 07 or 08. The stock piping is dual 2", and that is rated at 275 HP. For a 300 HP rating, combined with our cubic inch motor, 2.25" is ideal. To maximize exhaust scavenging, you should also put in an X pipe with a dual system.