Originally Posted by kotik
U can go SC route for like $8k (ess 535) and keep ur stock exhaust system. SCed m3 is a beast
I really like all Gen m5s, but the maintanance will kill u.
This ESS seems like the way to go on my M3. Curious why the S3 will be more expensive to maintain that the M3 once it is SC'ed.
Also, does the ESS on the E92 pass smog in CA?