I am not sure if this post should be here, or in the discussion forum, but here goes, I have been upgrading my August 2004 Z4 since I bought it almost 2 years ago.. Out has gone the manual cloth seats to be replaced with black leather electric heated seats. The steering wheel has been upgraded, to an MFSW?? I have bought a set of 108s that I am ready to have refurbished, I have just put in a Radiovox so I can play my iphone through my business radio. New roof motor as seems to be the norm, an OEM windscreen, to stop a leak. I have has a good bit of the interior wrapped in carbon fibre affect. I am booked in with Peter Van Der Veer to fit my electric folding mirrors, so now on to my next challenge, BLUETOOTH? How easy is it to do this and what parts will I need to pick up to do it. I assume that like all the other jobs I have carried out I will benefit from the Pre October 2004 having the full wiring loom, but what else will I need???