TTMBCLS

if i get a tune will my stock exhaust sound louder on a m278 cls550?

silvers2k

I noticed more burble/bark from my exhaust post Renntech tune. But I'm also running catless downpipes and resonator delete.

Might want to consider deleting the resonator if sound is what you are after. It's fairly inexpensive to have the muffler shop replace the resonator with straight pipes.

oldsinner111

I doubt it,todays cars are so choked down with cats,you can delete mufflers and still be legal.