from where?? you can always stick a match in the petrol tank, that will make a few flames lol.
flames are cuased when there is unburnt fuel going into exhaust - so you need to get your car to run very rich in deed - and need a decat too.
or you can purchase a bee r rev module thing - however, if over used can cause damage to the engine.
or you can fit one of them flamer kits where a spark plug is welded in your exhaust.
may look cool, but potential damage it can cause to your car, i personlly dont think its worht it.