if your car didn't come with a spoiler is there anyway you can order one and have the dealer put it on for you? it only came with the lip spoiler that comes on every G sedan.
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I am assuming you meant to say the chrome spoiler that everyone has...

You can always order the OEM one and have them install it for you. As for aftermarket spoilers, some dealers may install it others will not.

 

+1... back when we had our 07 G35x sedan, we bought the car and then ordered the spoiler from the dealer a month later.