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      04-12-2017, 01:11 PM   #50
Mackie02
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Drives: 2014 550i M-Sport
Join Date: Apr 2017
Location: Houston, TX

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Possible to Cut Downstream of Flapper Valve?

Quote:
Originally Posted by tp550i View Post
The factory exhaust is about 2-1/4" in diameter, but a good shop can make the tips 2-1/2" inlet diameter work.

I'd be more concerned about the 4" diameter outlet, since the factory muffler outlets are about 3-1/2" apart, center to center, the 4" dia. tips will be a very tight fit -both side to side and up against the 550 standard diffuser.

Its worth a try, you can always return the tips to Summit and go with 3" tips like the ones I installed
Is it possible to cut downstream of the flapper valve instead of upstream of it and just trim the Borla tip down then weld it?
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