I'm at less than a hundred bucks for all of my mods, including the sweet paint job, and 70 bucks went for adding the kammback alone.
Even though I'm pretty sure that kammback won't ever pay for itself in mpg savings during the life of the car, I did get a "wow, that looks better" from my wife (who carpools with me in that beast) after I took off the detached wing and added the kammback- - -so technically it's already paid for itself
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