Thread: X pipe Paired with Axle Back
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      10-14-2017, 01:51 PM   #6
6ixSpd
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Drives: '12 M3, '19 X5, '23 718 Spyder
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The benefits of having HFC instead of deleting all four cats far outweighs the 3-4whp you'll gain by being fully catless.
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