Hey guys, so i know this is not a new topic and has been reviewed a lot of times, however doing a little research im overwhelmed, too many options and too many different answers.
Im looking for the best exhaust system for my 350z, now my goal is the best performance possible without eliminating the cats cause i need to pass emissions, in your opinion what combination will give best performance and which brand, cause ive heard of true dual, straight pipes (but i need the cats so probably not this one), and there is y pipe, h pipes so many options, any advice will be much appreciated.

"Best" is relative. Some are heavier, some are louder, some yield more power. Lots of options out there, I have the tanabe Y pipe and exhaust, still have the stock cats. sounds OK, weighs only a few lbs less than stock, I think I read a report that showed it added like 3 whp. none of them make big gains. Pick one that you like the look and sound of.