Depends on what you want. For a low sound at idle(without resonator) and a great WOT sound, a stock look and good quality, I would suggest Stromung. I haven't heard too much about Magnaflow, but some people swear by it. 5Zigen products are normally high quality, but I don't think there's a specific bolt on application for the B15 Spec yet. I'm pretty sure it's in the works with a lot of talk over at B15sentra.net. You mentioned a Hotshot header being what you have got already, so I would recommend a nice resonator for your midpipe on your aftermarket catback due to the noise increase you'll definitely hear after you open it all up.Dreamin of 13's said:which exhaust should i use? stromung, magnaflow, or a 5zigen can?