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Old December 24th, 2010, 16:21   #45
Moderator at Large
Join Date: Jun 1999
Location: Brampton, Ontario, Canada

The aftermarket air intake system will make 0 difference to your car. Zip, zero, zilch.

The stock air intake is already a low-restriction cold-air intake. Open the hood ... see that little grid of openings in the plastic next to the latch? That's the engine air intake. It leads to a large-diameter duct into the air filter housing, and that leads to a generously-sized duct to the turbo inlet which is about as straight as they can make it. You can't eliminate restriction that is not there to begin with. You can't lower the temperature below the temperature of the air coming in the front of the car. The engine doesn't care whether the intake ducts are the original parts, or have a fancy brand name on them. A lot of those aftermarket air intakes use aftermarket-style air filters, which in many cases don't filter as well as stock-style air filters. All of this, and considerable other supporting information, has already been posted or linked to in this thread.

Leave well enough alone.
Brian P.
formerly ... 2006 Jetta TDI 5-sp, Spice Red, Unitronics stage 1, 0.681 5th gear.
and before that ... 1996 Passat TDI, Silk Blue
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