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01-29-2013, 08:36 PM | #1 |
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Has anyone just cut out the stock cats and replaced them with straight pipe or resonators. Performance-wise, how would this compare to the other catless x-pipes out there? Are there any disadvantages, is the stock piping diameter less than optimal? Would the sound be similar to stock if two or four resonators were added in addition to the oem resonators, or still quite raspy?
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2008 Jerez Black Metallic E93 6MT
K&N Drop In Filter | HPA Pulley | Custom Catless Resonated X-Pipe | BPM Stage II Tune | Megan Racing Exhaust |
01-30-2013, 08:47 AM | #2 |
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Drives: BPMsport 2012 E92 M3
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Yes, it's been done. Performance should be very similar to an aftermarket x-pipe. Adding resonators will always decrease rasp.
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01-30-2013, 10:59 AM | #3 |
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Vishnu got 13 rwhp and 28 lbs rwtq from deleting the cats on a stock x-pipe, with no changes to the tune and no water/meth.
http://www.m3post.com/forums/showthr...hop+cat+delete I think test pipes alone have been tested to show greater horsepower gains, but do not have links at hand to those dynos. |
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01-30-2013, 03:02 PM | #6 | |
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Quote:
Seems way above average.
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