I have been running the Evolve E-Tronic Exhaust since October and I have to say that it is the best sounding exhaust to date. I have run several different exhaust setups and always got bored of it (because of sound, and pitch) But with the Evolve unit you can open and close the valve and the pitch is just amazing, I have heard the kressig unit and IPE unit and was not impressed it sounded more like a fully catless unit. The Evolve unit is just a clean pitch and I love driving my car.
Evolve Automotive Representative
EVOLVE BMW E92 M3