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      04-05-2010, 05:02 PM   #44
shiv@vishnu
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United_States
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Drives: X1, 335i
Join Date: Sep 2006
Location: SF Bay, CA

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Why does it need to be custom tuned to run full boost?

And again, Mike, we are talking about the stock 135 catback, not aftermarket 135 catbacks. That does not apply to the OP.

Shiv