If you are thinking of fitting an exhaust flamer kit i have provided this link for you to see mine in action.... Scooby\'s Flamer Kit (Click me.....)

Additional Info, Flamers do not work on cars with a Catalyst Convertor fitted and best results come from a vehicle fitted with a Turbo.....

is there a recommended engine size, i mean wot is it worth fitting too.

No engine size recomendation matey, simply the more power, the better chance of it working and NO CATALYST so a De-Cat would have to be in order...... Alternativly i am currently designing a "Flame On Damand" system where you simply push a button and you will have instant flames out of any exhaust or car..... Catted or not, Turbo'd or not, even diesel cars hopefully ???? Will let you know once more research and testing has been carried out over the following few weeks......

butane flamer kits are good but i wouldent like to keep a bottle of butane in my car

Does that mean my car can have one ??

Any car can have one, there is NEVER EVER a guarantee that it will work though