Exhaust help!
Many people opt to go with catless downpipes for their M157, accompanied with a tune from a reputable brand like Renntech or Weistec. This will bring out the turbo spool, roar of the 5.5L V8, and with the tune get you to 760hp/852hp.




Removing just the resonator mid box is what a majority of people do. You'll get a great sound but not loud enough. Next is to remove the other set of resonators in front of the box (Pair of two, often mistaken for secondary cats even though they have no cat materials in them).
Boom! You'll love the sound. Keeping the stock mufflers is crucial to maintain that V8 rumble. Removing them for straight pipe creates a really high-pitched and unwanted sound IMO.
Take this advice how you want, I've never owned or been up close to an M157 E63. This was just my personal experience for my M278 V8 Biturbo which is a similar motor, I did extensive research on this topic before finally taking it to the exhaust shop. I wanted to do it right the first time. My next plan is to do C63 mufflers, if I can find a pair for a good price. Good luck and keep us posted with sound clips!
Stock exhaust setup
Both resonators deleted, sounds amazing
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Removing just the resonator mid box is what a majority of people do. You'll get a great sound but not loud enough. Next is to remove the other set of resonators in front of the box (Pair of two, often mistaken for secondary cats even though they have no cat materials in them).
Boom! You'll love the sound. Keeping the stock mufflers is crucial to maintain that V8 rumble. Removing them for straight pipe creates a really high-pitched and unwanted sound IMO.
Take this advice how you want, I've never owned or been up close to an M157 E63. This was just my personal experience for my M278 V8 Biturbo which is a similar motor, I did extensive research on this topic before finally taking it to the exhaust shop. I wanted to do it right the first time. My next plan is to do C63 mufflers, if I can find a pair for a good price. Good luck and keep us posted with sound clips!
Stock exhaust setup
Both resonators deleted, sounds amazing
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Highly recommend, picked this beast up less than a year ago and loving every minute.

Highly recommend, picked this beast up less than a year ago and loving every minute.
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If you don't mind divulging, how much did you get it for? 37k miles is nuts!





If you don't mind divulging, how much did you get it for? 37k miles is nuts!


