I would beg to differ...
Although opening up the collecter is obviously gonna be a plus, the sound that our cars make with stock manifolds or headers is pretty damn close to the same...My 95 & 90 sound totally differant both have hogged out manifolds, but never heard a differance in the EXH. notes that either of them made after the manifolds were Hogged out...Both of them run 2-1/2" downtubes, no cats into a 3" Magnaflow Resonator, then back to the dual 2-1/2's again...One sportin' 40Series Flowmasters and one with Stainless Magnaflows...They both sound great, but i prefer the Magnaflow sound over the Flowmaster..But then again nothing sounds like a Flowmaster...LOL...Both sound pretty mean...
Even with all that room in the EXH on my 95SC it hits 16psi with a 5% pulley...My 90 never ever hit those psi numbers...Could be stock gauge is off...Don;t know, but that is alot of PSI for an open EXH SC...
Cheers