As others have said, the button (outside) placeholders are for heated seats. But keep in mind, the NISMO models do not come with seat warmers.
Also, are you set on a supercharger, or would you be open to a turbo set-up? The Stillen supercharger is great, but the gains are limited compared to a turbo (or twin-turbo) set-up.
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Current Ride: 2012 Nissan 370Z NISMO #0389
Mods: Fast Intentions Resonated Test Pipes and TDX Exhaust with 18" Resonators (#1054), K&N Drop-Ins, GTR Start Button
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