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Should be some type of gains as long as you aren't sucking in hot engine bay air. Hot air will negate any positives and may actually be worse than a stock airbox with a K&N or similar hi flow drop in. Just my experience any way. If you can block it off to pull cold air from the front or wheelwell, as Harold did, it should most definately be better than a stock box. Good luck!
I got a knock of aem Cai from eBay over a yr ago for about 100shipped. Has done it's job an even came with a tb spacer!! I'll have some use for that one day
I was talking about taping the tb for spray
But I will let you know. I know a couple local guys that have a u/d for there 4th gens. Just waiting for th to put on.