The only thing I could find is this:
"They sell a Motec system exhaust from the Racer's Edge shop outta L.A.
When your car's only topped out at 140 and you need to step it up get some of that Motec.
And some Mashamoto ZX tires (from the street racing world) along with the green neon glow from under the chassis."
I am sure the kit would also contain some kind of "FART CAN" for the extra added horsepower...:p