Andy - You may as well have asked which is the best religion. There is no best exhaust answer. Tell us what you definitely want and what you definitely do not want in terms of sound, drone, cost, etc. and we can help you narrow your choices down. Every exhaust is a compromise somewhere whether it be price, sound, appearance, etc. The first question I would ask is what is your budget?
2013 E92 M3 with ESS VT2-585 SC, StopTech BBK, ESS Full Exhaust, and a bunch of carbon fiber ... - SOLD