Re: Air box interchnage& performance upgrades
All you need is an aftermarket air filter. Buying the whole cold air kit will not get you anymore performance over buying the air raid or K&N filter and dropping it in. The stock filter box is basically already a cold air kit, drawing air from the drivers side fender. The cheapest Air raid filters I found (and I also have a n/a 06) was at performancecenter.com. I also bought a jet throttle body spacer there and am getting almost 2 mpg more.
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