Something to keep in mind. A turbo charge is not a positive displacement pump so any restriction you put on the inlet will reduce it's effeciency. The primary benifit to less restriction is quicker spool up. The cold air benefit is the same regardless of whether the motor is a trubo or AN. Colder air is going to see less temp rise in the turbo, less heat for the intercooler to remove and ultimately a cooler charge into the engine.
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Dave Clement
\'03 GT, Electric Blue
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