Troy and Tbyrn, I believe we're talking about two different packages here, First the Aero Package is 550 and comes with:
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• Rear spoiler (shown)
• Rear underbody diffusers
* Requires Sport-Tuned Suspension Package.
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Second the Aerodynamic Body Kit is 2910 w/spoiler and 2420 w/out. It comes with:
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Color-matched, aerodynamic body styling components provide an aggressive, aerodynamic appearance for your G35. The 5-piece Aerodynamic Body Kit includes:
• Aerodynamic Front Bumper (shown)
• Side Sills (set of 2)
• Rear Spoiler (shown) <font color="red">[only if you order the $2910 package]</font id="red">
• Rear Under Spoiler
4-piece package also available without Rear Deck Spoiler.
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Here's a pic of the Aero Body Kit w/spoiler:
Yes, I believe you can get just the underbody diffusers from the Aero ($550) kit but Infiniti website does not show pricing, I'm guessing around 60 dollars because the spoiler is 490 dollars (got this price from subtracting body kit price w/out spoiler from body kit price with spoiler).
Riv
-6MT Sedan, Aero, Black on Black