hey guys, i'm thinking about throwing a cat back system on my car, slp, i have a 85 iroc-z with a 305 tpi, i'd like some feedback on how people like the sound of it, i've heard a fourth gen that has slp but its been awhile, but i want to know how it sounds on a 3rd gen, whats also the difference if you run two cats, is there an actual sound difference, does it sound better,i'd imagine so, but maybe i'm worng. Am i even able to throw two cats on my ride, stock's one, i'm worried about passing smog in the future, it has a new engine, so it runs good, but will the dual cats screw it up with smog? thanks for any feedback