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      10-03-2020, 10:49 PM   #2
GORDON.M3
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Drives: E92 M3 • G05 X5 M-Sport
Join Date: Dec 2013
Location: LAX/YYZ/NRT

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My buddy Embolus*M3 has AA (100CEL) HFC's on his OEM x-pipe. Sounds great and virtually no smell at all. If you can smell it with the driver side windows down, that mainly means you have a leak. The BW x-pipe is tricky to get a perfect leak-free setup. If you want perfect leak-free, I'd cut the flanges and weld them all.
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