3.0i M54 exhaust mid resonator delete

S

SteatoLegato

Member
After much research ended up doing the mid-box delete mod at my local muffler shop. This involved removing post-cat converter restrictors and the mid-resonator and then welding straight 2.25" pipes to the ends.
Result: minimally louder (gurgle) at idle
approx 25% increased sound at low load revs, more raspy (higher pitch) compared to stock (reminds me of the e46 M3 but less loud)
Much more pronounced growl at load especially low 2-4K revs
Obvious pop and crackle on overrun but no explosions and not obnoxious

Overall, I'm pleased as most bang for the buck mod while keeping things stock and legal. Took the muffler guy 1.5 hrs to do from me driving in to driving out. Aftermarket muffler is also an option, although limited space, and can be added if the sound isn't loud enough

Hope this helps someone, I'll try and get a recording done someday
Exhaust.jpg
 
[ref]SteatoLegato[/ref], can we get an update on this one please? I want to do some exhaust fettling on mine and I’m becoming more and more convinced that a full back box delete will be a mistake. Did you remove all the ‘extra bits’ between the cats and the back box? That will be two resonators on part 5 and one weird flat bit on part 7?

Do you have a video??
 
Nothing worse than following an E85 with gutted back boxes for 200 miles! :thumbsdown: :headbang:
 
mid-box delete isn't anywhere as loud as the muffler delete, just audible at 40 miles/hr and a little pop and crackle on upshifts... Once i get a chance I'll try to make a vid and post it here
 
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