There's a modded Forester that runs around here that I've seen spit flames. First time I saw him he was hammering on it to merge onto the highway and got 18" spits on each shift.

When I first got my old Mustang LX running with the turbo motor swap, it would spit a huge cloud of fire underneath the car. Three cylinders, unset timing and open downpipe = lighting up the entire road from under my car. I could see the flash through the shift boot.

 

If you want to spit fire, you need to be cat-less and big turbo, STi's to it because if you run a BOV and are cat-less, the engine will run really really rich for a second under high revs and cause the unburnt fuel to ignite in-between shifts down the exhaust pipe. Atleast that's what many of the "shoot flame" threads on NASIOC say..

 

Sweet, shoot flames and get tickets from cops for having no cat.

Sounds like a GREAT idea.

One of my cars shoots flames because it is turbo with an atmospheric setup blow off valve, is maf based, and I have no cat.

My other car shot flames because it is a rotary and yeah.