I quite like the little Honda CR-Z hybrid, and turned around the try to see what it was first time I passed one on the road. It's a striking design, and looks like "high-performance".
Though heavily modifying one would violate multiple federal and state emission-controlled-vehicles laws, it screams "I want to be a hot-rod" to me. Apparently I'm not the only person who's heard it.
Though these are obviously artists' renderings, they're pretty cool ideas for models IMHO.
Fujimi does one in 1/24.