Originally Posted by Jesal@IND
I have Eisenmann Sport on my E90 M3 and love it, however I do have the Challenge Sport x-pipe (HFC) with it and personally think its one of the best combos out there.
Since you are local you should stop by and I can let you hear it.
I'm zeroing in on this setup too. How do you like it?
I'm thinking of getting the x-pipe soon and hopefully will pick up the Eiseneman Sport not long after. I understand the x-pipe with the stock exhaust is a little raspy, something I have an aversion to.