The road noise is a little worse with the sport tires. If you really want to cut down some of it, you could consider a softer compound tire down the road. Of course handling would be slightly effected.
The stereo has always been a huge pain point for me. I have an 09 touring and still have the OEM Bose. In this vehicle the Bose is pretty crappy, no matter what year Z you have. I've installed a few little add ons to make it a little more user friendly, but it still stinks. Every now and again I consider replacing it, but always find some sort of performance mod i would rather spend the cash on.
Do you plan to do any mods?
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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