PovertyFacelifted SL55 is faster than the M6. The germans are definetly stepping up their game especially mercedes of late. I mean the new sl65 that will be stripped down will probably post a faster time than the Z06 around the ring if a 1900kg sl55 can do it in about 8:55
I assume you mean 7'55"?
If so, the unrestricted M5 is already faster, and the unrestricted M6 should be even faster than that...