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      03-13-2013, 06:43 AM   #3
gatorfast
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Drives: MR E90 M3
Join Date: Jan 2008
Location: SoFla


Posts: 2,634
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I didnt have the fabspeed x-pipe but I had an exhaust shop cut out the secondary cats and replace with straight pipes (essentially the same as the fabspeed pipe).

Paired with my oem modded exhaust it produced a noticeable increase in volume but got very raspy. Had it like that for 6 months or so then got sick of the sound and recently welded in a pair of resonators to rid the rasp.