Exhaust is probably going to have to wait a while though. Doing the headers/cats is a decent chunk of change and I hear your low-end really suffers if you don't tune immediately. Right now I'm looking at around $2500 for headers/cats + install and uprev. Add a FI exhaust and that becomes 4k.
Still haven't answered my question re: HP gains between exhausts. If it's just a look/sound/feel issue, I'm not overly concerned. If you get an additional 20 hp over the factory nismo exhaust, that's a different story (hyperbole but you know what I mean).
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