You will not notice any performance gains. In fact depending on your ECU and or how sesitive your butt dyno is you may feel a loss in power in certain RPM ranges. That being said I run one with the airbox mod and the rear hood seal removed and my car runs great. It pulls strong and hard up to 6k. This tells me the best bet is to get a CAI that pulls air from the lower front portion of the car. The difference between having the rear hood seal in place or removed with a modded airbox is amazing. You can actually feel it and of course with a modded airbox you can hear the pssssttt loud and clear. On the other hand it will cost you $150 to replace the airbox if you want to go back stock so again a CAI is a better bet.
On my Bug, I can definitely heard the turbo whine better. Not by a heck of a whole lot, but it is definitely there. Plus, while I didn't notice any horsepower gains, throttle response was better, with the tach going up faster.
It's only US$50, so what's the big deal? Just drop it in.
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