So I just installed one of the new, modular SLP LM catback kits on my 1996 M6 Z on Saturday. After reading many of the posts in this forum, I decided to go with the LM because I'm still running the stock manifolds and cats, and have no plans to add headers in the immediate future. Wow. The car sounds mean at idle. I love it. It gets a little loud, even inside the passenger compartment above about 3k or so. I'll drive it for a few months, but might give some consideration to ordering one of the LM II resonators. We'll see. My question is... the exhaust seems to cause a noticeable vibration that can be felt while driving. If I can feel it... should I be worried about the vibrations causing false knock to the point that I should order an LT4 KM?

P.S. My only other mods are K&N CAI, TB! and a bunch of suspension stuff.