[anthony2066]

I recently took off my muffler and went stright pipe only, will this affect my performance or over all hp negatively or positively? Also if i also take the resonator off how wil that affect the car aswell?

[954Stealth]

I don't think you'll see any gains with a 328i quite honestly. Some have actually reported a decrease in hp that came with the decreased back pressure. What are you going to do with the cats?
Most leave the muffler and delete the resonator. I'm curious what you think of the sound and the volume with your straight pipes. Too loud?

[anthony2066]

i actually dont think its to loud at all, sounds nice and nothing like a honda civic with a 3 in pipe, more like an M3 sound very clean, i was actually gona delete the resonator also to see what kind of sound i would have