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H&R springs are the lowest drop on the 750. Eibach rides better, but a slight drop. You'll need lowering links for the rear, since LI have air suspension in the back if I'm not mistaken. That's why AC sells only the front springs for the F02.
Save your money on Brembo, unless you like them for looks only. The brakes on the 7s are good enough to stop a 4,500lb vehicle. Use the money for a nice set of forged wheels and tires.
On tunes, people like Dinan for the warranty (which your 4yr is up). Burger Tuning is developing a tune for the N63, a lot cheaper.
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