Got my R about 6 months ago and now after the initial woody has subsided I'm starting to think about modding it. The car right now is bone stock and I'm leaning towards a 4-1 header w/ a high flow carsound cat. I love the look, fit, and sound of the stock R exhaust, so I don't want to mod it all just yet. My question is, will say a toda header and carsound cat bolt up to my stock cat-back?? I know about the 2.5" vs. 2.25" difference between the two, but is there any way around this?? Any suggestions are appreciated in advance :lol: