Gutted E550 M278 mufflers
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Joined: Jan 2017
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E550 c207
Honestly, it was just to see how different the acoustics would sound as some vehicles with gutted mufflers give a more throaty sound. Not the case with the E550. The money and work was of no concern, so I didn't mind paying to have it done as an experiment. Each modification done gave a unique sound, which was I wanted to do to help others, and give them more options.
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Joined: Nov 2019
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Considering a 2014 e550 coupe
Honestly, it was just to see how different the acoustics would sound as some vehicles with gutted mufflers give a more throaty sound. Not the case with the E550. The money and work was of no concern, so I didn't mind paying to have it done as an experiment. Each modification done gave a unique sound, which was I wanted to do to help others, and give them more options.
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 45
Likes: 1
E550 c207
I replaced the resonators with an X pipe, then straight pipe back. The shop did some bends to clear the brace, so any skilled shop should be able to do what you’re asking.
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Joined: Nov 2019
Posts: 11
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Considering a 2014 e550 coupe
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W212 E550 4matic
So just had my 200 Cell high flow cats installed and they cut the old down pipes down to almost the flange and rewelded pipe on for $120 per bank. Not bad. Might eventually clean it up with stainless once I decide on what I want. Definitely more drone, but not bad with the windows up. Loss of low end, but may put an x-pipe in later this week to balance out the exhaust gases.
Great write up and super helpful ! By any chance do you remember the diameter of magnaflow 200 cell cats? 2.5" or 3"?
