I've seen it on supra's (no, not the fast and furious) it is funny as hell, I had a friend with it on his Nova, a separate fuel line and injector and spark plug to lite it.

MAtt

 

Lets suppose you wanted more then Flames. Add an opening to the Muffler tip where the Flames would emerge, then adapt that opening like an opening like a FLute to mix the incoming air and the fuel and more flame for less gas.
Ok your not finished yet cause your car does not sound like a V-8, you could arrange the flange of the air intake to be inline with 4 small holes one right after each other = > || o o o o . Now make an electric operated valve to open or close for what ever tone you want to produce from opening one (o) at a time, closer to the || the higher the pitch of 4 cylinder sound, farthest away is the V-8 rumble. Flame or no flame it has pizzazz.

 

hey. all u need is a MSD ing System and the Step2 launch system.
My boy has it in a civic, it's shoot flames and has a loud bang to it.