Looks and Sounds
so far, i really liked Active Autowerkes pipes, all polished chrome, very nice looking, sound wise, anything with a growl as appose to a high rasp. but i guess that the 335's performance will partly dictacte its noise? simple bolt-on with no modifications, bigger tips, perhaps 90-100mm. dont shoot for comparisons of cars like G35 or 350z's, try to shoot for Ferrari/Porsche like! usually Supersprint have nice sounding exhuast systems
http://www.e90post.com/forums/showthread.php?t=48260
quality quality quality!