I was wondering if there are any option codes on the car or any markings after the window sticker is removed that states the car came with optional 18" wheels. If you look at the production numbers they are drastically different with the 18" wheels. I mean can you just get some 18" wheels off ebay from another Goat and throw them on your car and have a double digit production number car instead of a triple digit basically without anybody knowing. Just asking because I just recently wrecked my 05 Impulse Blue, w/ blue leather, automatic and 17" wheels and bought an 06 Impulse Blue, w/ blue leather, automatic, and 18" wheels. I want to know if there is a way to tell if the 06 came with 18s or if someone just put them on there.