Just wondering what type of exhaust to get. I have an all-motor set-up (1.8L GSR, with 12:1 compression, Port Flow GSR head,...), I have a custom header with a 2.5" collector. The question would be should I get 2.5" piping all the way through or 2.25" piping. Also should I run a resonator? And the last but not least is what is a good exhaust to get, sound and power wise?