Tuning
I hear BMW will be putting out their performance engine upgrade in June-ish time. ACS is expensive and not really sure if it keeps warranty alive. Same with Evotech Motorsports, although I might go that route. Evo will save you some $ and provide the hps bump you're looking for. Hartge is another option...there's actually several other places. Search the threads and you'll find that many of the ups that are happening stateside are available here -- obviously not Dinan, although their web page directed me to a location in England. Anyways, hope this helps in your search.
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