Thread: X-pipe 101
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      05-11-2012, 02:32 AM   #12
KMIII
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Drives: 08 M-DCT E92 M3
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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?
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