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      02-05-2016, 11:03 PM   #18
BMSE92_Harry
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Drives: 08 335i coupe
Join Date: Oct 2013
Location: Tampa

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Those of the with PE muffler, did you guys cut out the mid cat after the downpipe?

I wanna know if there will be a performance gain. Tuners have mentioned that changing it to a high flow cat will gain some HP, considering if you are already FBO and pushing 450+ to the wheels.
Also, if running PE muffler without any cat, will it have a lot of drone during highway cruising?
Appreciate 0