Hey guys, just trying to get some info on some exhaust specs if anyone has it. Got a stock 2012 WRX sedan and have had it for about 4 months and I'm already itching to put upgrades on it and one of the very first ones I wanna do is a cat back exhaust change and go from there. As far as how far I want to go with upgrades, it's my daily driver and would probably only take it to a strip a few times but still want a decent street car for when I wanna get on it if someone is challenging me on the road so probably stage 2 is as far as I would go. I've narrowed it down to 3 choices...Perrin, Invidia Q300, and the Magnaflow Sport Series. I'm looking for that great sound that each of them can produce but am also interested in the horsepower gain so my question is does anyone know the HP gain specs for each of these for a just for now stock setup?? And what do you think has the better sound?? Thanks.