I recently made the same change! Bought an M4 competition and am keeping the Z. The M is a beast at the track, but you can definitely feel the weight of the car. It needs front camber plates and track specific wheels, but is otherwise perfect. Brakes are great, no fuel starve or oil overheating …
I still love the Z and plan to keep it. They are 2 different animals.
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Stillen | EVO-R | HPS | K&N | Hotchkis | Modshack Oil Cooler | SPL
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