By the way seeing how serious you are about this you should contact Craven328, he's done extensive modification to his 328, from headers to custom exhaust and tuning. He won't know specific questions regarding parts for the Z4 but he'll know everything there is to maximizing the N52. For the most part, nobody here has done anything beyond an exhaust on the 3.0si so most of your questions will go beyond our level of expertise (or experience).
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