We can hardly wait for the base model Nissan 370Z to hit showrooms, but even before it does, Nissan dealers have already accidentally let details loose on two performance packages available straight from their dealerships. Our assumption would be these Nismo S-Tune kits should retain the factory warranty while upgrading the looks (supposedly) and performance. Details follow the jump.

The Nismo S-Tune Aero Package focuses on aerodynamic and aesthetic mods, eliminating lift, increasing downforce and minimizing drag. It includes: - Nose Extension - Front Lip Spoiler - Side Skirts - Rear Spoiler - Rear diffuser - Nismo Floor Mats (score!) The Nismo S-Tune Performance Package is the one we’re interested in, bringing simple, effective modifications that should make the most of the 370Z’s performance: - Stainless Steel Performance Exhaust - 19” Forged Aluminum Nismo LMZ5 Wheels - Nismo S-Tune Springs and Dampers - Nismo S-Tune Brake Pads - Nismo Floor Mats (double score!)

Pricing isn’t announced yet, but expect to pay a little over the odds to have any of this fitted at the dealer. We’ll be bringing you live coverage of the 370Z’s official unveiling at the LA Auto Show next week. [via WCF]