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All COBB Tuning AccessPORT for 135i Discussion Here
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03-01-2011, 10:32 AM
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Nifty
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Drives: 2022 AWD M3
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I'm on the fence about this. Realistically what kinds of power differences are we looking at between JB+, JB4 and AP on a completely stock car? I can look at dynos all day, but they seem to be all over the place.
Appreciate
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