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Actually Christ, thats a good question. I have no idea if OE caps would fit. I don't have any on hand (don't want to pull them out of my winter wheels and sold my old OE 17s). These center cap stickers are aluminum backed and only cost 7 bucks on ebay. They seem like a really nice product, and fit right over my new wheel center caps.
As far as mileage is concerned with the new wheels/tires and air intake, I'm not really seeing any benefit - yet. My last tank was compromised with troubleshooting and hard acceleration testing. Plus a different pump and fill-up procedure today. doh. Nothing lost though, at 47.x mpg.
I keep screwing with my engines calibration (this time with MAF sensor swap) and thus affecting fueling and turbo boost maps. Makes it hard to find minute differences. Hopefully when I get everything fully sorted I'll nail down a 50+ tank.
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