what part of florida are u from?? cuzz if frum coral springs. Theres a place in miami called mms tuning, which caters to mainly bmws. I've seen their cars and they know how to hook up bimmers. Check them out at mmstuning.com.
Also, theres a place in hollywood,fl called madmods I've seen pix of a couple bimmers that they've worked on too. They look real nice. Check their website too at madmods.com.
But if you want to go with performance parts, there's a place in miami called active autowerke, they really know alot about performence upgrades for bimmers. I had my intake, exhaust, and suspension kit done there. Check them out at aatuning.com, they also have a sale going on right now.