I put some new aftermarket valve stem caps on my wheels. It didn't cause any performance or reliability issues. My long experience with modding, particularly as cars become more electronically complex, is that anything beyond those valve stem caps is pushing my luck. Driving this Z is the part where I derive the fun - no longer interested in the tinkering after decades of dealing with the consequences of trying to outsmart factory engineers. Modding it would be, for me, taking me in the opposite direction.
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