So guys... I got my muffler on today. Last week I ordered a Super 40, 3 i/o, offset, and hot damn, it sounds feckin' awesome. However it does have some pros and cons.
Cons: the muffler has this throaty tone, which is great, but it sounds almost a little too throaty. When idling or at really low rpms it's almost like there's a pillow shoved in a pipe somewhere. I think next time I redo my exhaust, I'm going with dual glasspacks.
Pros: Sounds great when you get your foot on it, you'll DEFINITELY get noticed, and I can legitimately feel it accelerate faster and easier. Maybe this wouldn't happen when going up from a stock muffler, but my stock muffler was broken, had holes on the bottom, and had baffles loose and falling out, so this was a pretty noticeable performance improvement.