[M3Dom]

Originally Posted by godora

its really really hard to achieve quads on 328xi and make them BOTH get rid of the burnt emissions. you can get a exhaust that has quads but only 2 of the tips are getting of the smoke and other 2 are just for the look of quads.

here is one thread:

http://www.e90post.com/forums/showthread.php?t=168149

thanks