Join Date: Nov 2002
Location: SouthEastern PA
I say exhaust! I think the worst part isn't from the resonator back, it's from the resonator forward. For the low-$ solution, I would get ported stock manifolds and custom downpipes with hi-flow cats, then a y-pipe into your existing piping. You could do the rest later by increasing the tailpipe and muffler size and swapping to the appropriate y-pipe.
Owner, 1990 Thunderbird SC, white w/ gray cloth