KH, I went thru this same issue, and then decided it would be better to mod my car and cheat the insurance company out of knowing I have a supercharger...It's nice not having to worry about a "used" car (somebody else's problem) and know that I've got 427 horse at the rear wheels when I want or need it...
I also despise car dealers, because no matter how well I think I did, I always go home thinking they got me somehow....