Originally Posted by urmomgostocollege
I haven't heard either on the 135i, but I have heard the Eisenmann race on an Audi R8 and it would be pretty obnoxious for a DD. You should also consider the Eisenmann sport.
I heard the sport is not worth it even though it's much cheaper for about $500. That's why I'm thinking about the race one. After all, I will only do muffler mod and keep every other pipes stock to reduce the possibility of making too loud exhaust sound.