Ricer

Ricer, noun.

A car, usually an inexpensive and unassuming (i.e. slow) Japanese import, extensively modified with tacky cosmetic elements such as needless spoilers, side skirts, and garish decals in order to look like a fast, sleek vehicle.

Joe: Wow, that's a slick ride. Look at the spoiler.
Steve: No, that's just a ricer. It probably can't break 90 mph.