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      03-07-2019, 09:02 AM   #238
cenz422
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Drives: E46 M3
Join Date: Oct 2014
Location: New York

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My friend mentioned losing boost pressure when upgrading the FMIC. I am on a stage 2 with upgraded cat, exhaust, charge pipe. I thought there would be loss if i was stock and installing lets say a CSF because its one of the larger ICs. Any thoughts?

Additional question, what if I was to switch between my stock and stage 2 tune would a CSF IC still be good to have or would I need to switch back to stock IC?
Appreciate 0