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performance air filter versus cold air intake system

Engine

Vehicle Information: Year: 2003; Engine (Size, Modifications): 3.6 twin turbo, milltek exhaust; Total Mileage: 20000;

I am considering a GIAC ECU upgrade. I am interested in the difference between installinga performance air filter such as BMC or AFE. Will there be a performance difference from installing a cold air intake such as from EVOMS? I prefer to preserve the oem air box.Collin

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