OEM M3 or M5..how do I know, because I used to have an A4 and the Audi guys have been doing this mod for years. Dont believe me, do a search on the audiworld/audizine forums. These go on sale on ebay for $20-40 bucks. So you say that the unlimited tuning ones are higher quality, ok the OEM one from the dealer goes on sale for about $90 bucks. Looking to save you guys a few bucks I knew some place selling the larger version too but for a lot less than $175

http://cgi.ebay.com/ebaymotors/ws/eB...969925021&rd=1

 

just an fyi.

i've looked into this in the past and can see where you are coming from. based on measurements i've found online on the oem BMW pieces, the measurements aren't exactly the same. the oem BMW pieces are off by a few quarters of an inch IIRC.

true there are abs replicas on ebay, etc. however, you should also take into account the time/cost to make it to fit since abs is fairly rigid and doesn't bend easily. the UT lip spoiler lines up perfectly from side to side and trunk edge and was pretty much a no brainer to install.

granted in the end it's your money, and you can spend it however you feel. like i said i considered doing the same type of setup, but approached UT about the availability of such a lip spoiler. when they informed me of their pricing, i asked around about how much it would be to do the ebay spoiler and decided that it wasn't worth my time/effort/money to get something that might look how i want it to look.