Originally Posted by nick325xit 5spd

I will say that the magnaflow mufflers have not been a good experience for me on various BMW I6es. I've tried a lot of Magnaflow combinations and they were too loud and too drony down low. If you need a muffler that's loud enough up top and not bad on the street, I have yet to find anything that touches the Dynomax Super Turbos.

Edit: This does not apply if you keep the center resonator, which seems to do nearly all the muffling on E53s (and also at least the I6 E39s).