price range will depend largely on your location, the competition of the shops in your area, and WHO YOU KNOW! i've heard of $200-$300 and i got quoted at $100. a friend of mine got his civic dropped for $0.
start networking. find people in your area (maybe your age range) that are into cars too. find the do-it-yourselfer. if you go to a shop and they charge something ridiculous, try to work a deal on the side with the installer.
use these tactics for this and your other mods in the future. some things you can do yourself, some things you need a buddy, other things you need a pro install. ask here first tho - save yourself the money!
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New goal...  yea its an M3! 
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