if you're going to paint it, get the jbspeed. if not, consider the factory perf spoiler. people have gone both ways and been fine with either. the bmw part has a little better quality control on the weave, but it's not like the jbspeed is bad. there are plenty of very positive reviews for it on this site.
installation is straight forward. lay your tape down, press, and if it lifts or gets weird, redo it. I'd be tempted to use the betalink if i did this all over again because i have no intention of taking it off
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