gruppe m does indeed make a specific intake for the 06-08 3.0si z4's with the n52 engines. i'm not sure who the distributor is in europe, but if u buy direct from gruppe m, it's going to cost an arm and a leg.
u do not need to buy spare k&n filters. all u need is a k&n oil recharge kit and follow the instructions to clean and re-oil ur k&n filter every 5,000 miles or so.
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