http://www.redlinespeedworx.com/
Washington (Warren County), NJ
Guys are awesome, specialize in S4 work but I've seen plenty of BMW/MB/Porsche jobs over there that were done great. Haven't experienced as a customer firsthand, but have many friends who swear by them. I've also hung out with a few of the guys there BS'ing and they're more than willing to talk cars all day.