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First of all--
I can definitely appreciate you wanting more performance out of your Z4. However- you have two major issues confronting you. 1st is that you have a 2.5... Nice car for driving on sundays, but a stoplight scorcher it will never be. Best bet is to trade it on a 3.0SI or M coupe. 2nd is- unless you go Dinan (and I don't think they tune the 2.5 but I will check tommorrow at work) aftermarket tuning on BMWs typically is horrendous at best. I can't tell you how many times we see a "modded" BMW come into the dealer for service and the techs all chuckle at the sloppily installed, poorly fitted, under engineered "performance mods" that are typically painted blue or bright red or some other high vis color.
Not trying to be a downer-- just my honest opinion.
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