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Surley a 'Cold Air Induction' Is better for a performance tuned engine..
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Why?
Because they look more powerful?
Because they make more noise?
Because the company that make them says so?
Test them yourself...on a dyno...back to back and you'll see.
You will get nothing from changing your airbox to a CAI on an S3...the standard aibox is not restrictive, it's an insulator of heat (a good thing) and it's fed by cold air from the inner wing.
If you are concerned that the feed to the airbox is too small...you can fit a larger one - I had a 100mm duct from the front of the car where the pass side IC used to live, straight into the standard airbox, with a standard filter.
No gains...dyno proven.
You get noise and bling. That's all.
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But if they offer nothing more than noise then i will remove mine and ebay it...
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That's up to you...
It may look better to some (no to me though) but it won't give you reliable, dyno-proven power. The standard Audi stuff just isn't restrictive.
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As for the denting the bank balance, what about the 10k he spent on getting that extra 140 hp. CAI would be drop in the ocean.
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Maybe...
Or maybe he doesn't see the need to add bling factor points for no gain after spending all that cash?