I think if they had a Bonneville on Monster Garage they only thing they could do with it would mod it with a rocket and take it out to Bonneville Salt Flats and set a new land speed record (for fastest sedan). Yea Baby!!!
I been doing a little thinking, and it would be cool if they turned one into a full out assault vehicle. Pop the trunk and SAM'* would be aimed upward, the back doors could be turned into suicide model doors and several automatic guns would be facing outward. Then if the car gets in a jam, push a button and the transmission drops out from underneath you and turns into a bomb. Like a warp core breach from Star Trek. Yeaa, Destruction!! Give the audience some of that American Bad ***!
I've mentioned this before, but I did mount rocket launchers in the hood of my 73 Cutlass * when I was forst in the army. Drilled holes in the hood, use PVC tubing for the launchers, and model rocket engines as ammo. Shot a Saab once, for intentionally cutting me off on the highway. All it did was glance off the hatchback, but it was still cool (and stupid)