Since I have Access To the equipment and the knowledge to do so, I figured I could build my exhaust rather than buy a bolt on kit....At least from the cat back.. But my question comes to back pressure, future mods, etc. I was reading the thread about the J-pipe and got the impression that I should not increase the size since I don't have F/I yet. True? Also, what diameter pipe should I go with from the J Pipe back? I'm hoping to get the done next week on my off days, as well as install the thermoblock spacers. Any input on mufflers? I'm wanting to keep the quad tip setup....

Thanks
-Nick