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I have been looking around for mods for my Z4 M40i too. I found that mission performance and RK tunes both have tunes available. Bootmod is still working on theirs but it should be done soon. RK tunes has a downpipe available also for $400 (it shows on the website that they have it for the Toyota Supra only) I emailed them about availability for the Z4 and they said the tune and the downpipe are available for purchase now for both vehicles. K&N has now listed there filter on there website, likely wouldn't give much power but might enhance some sound. I am likely going to start with a downpipe then I might decide on a flash tune over the winter. The only mod I have done so far is spacers 10mm front and 13mm on the rear from burger tuning.
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