Is there a way around the cats?

I've been wondering about putting a flamethrower kit on my car lately. Now this is a small engine car, with EFI. I know that there are kits for the EFI's, but i'm not sure about the cats. Most say that you must have a cat free exhaust to hook your car up with the kit. I've heard about ways to get around this, but I am not too sure about how. Is there a way to hook up a flamethrower on your car with leaving the cats on? I know how most of the kits work, so in short how would it work if you could get around the converters?

First, I must ask you:
WHY would you want to put a flamethrower kit on a "small engined" car?

The flamethrower kits use one of many ignition sources. Some use the ehaust heat and just inject fuel up near the hot side of the exhuast. This type can't have cats. The second type injects fuel near the end and uses a spark plug to ignite it. Home brew kits are easy to make. Just find some genius way of injecting some fuel, and stick a spark plug on a switch. Your biggest concern is going to be velocity. Most flamethrower kits on V8s use small exhaust diameters and have to rev it way up to get enough velocity to throw the flame. On a 4-banger, you might need to use a tiny exhaust (like 1") to get the required velocity, and I would also run the pipe at least 6" back past the bumper. Other wise what you get is basically an 1800-degree bumper melter.

Its a tough thing to engineer for that reason. Best of luck