Thread: X-pipe 101
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      05-11-2012, 02:37 AM   #13
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Drives: 11 E92 M3, 13 X3 35i, 14 650i
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Originally Posted by KMIII View Post
What would be the difference in sound and power gains when comparing the challenge street to the other 2 models (Sports, Race). I know the Race is completely catless so it would have the greatest power increase. What would I be losing if I went with the Street version?
The street is the x-pipe only, it doesn't have the deleted primary cat. So you have to connect your oem primary cat onto it or get a turner test pipe and go cat less
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