Supersprint sounds the best IMO, but they are pricey. I'd skip BMW Performance exhaust at all costs. A recent test in Euro Tuner's Project 135i project car showed a 3hp LOSS with the $1500 BMW Perf Muffler. Must have put Window Regulator Hanz in charge of that department too.Beauty is in the ear of the beholder, my boy. Start looking at manufacturer`s websites, and check out their sound clips.
It all depends on *what kind of sound* you`re looking for. You`re never gonna get that little inline six to sound like a V8 Camaro or Mustang, no matter *how* much money you spend....The thing is I have been looking on YouTube but I can't find anything that sounds good so I think I'm just going to get a custom exhaust if all goes bad