You are aware "Cherry Bomb" are an old school silencer manufacturer, nothing special. http://www.cherrybomb.com/ Yes most of them are legal. But don't do it, it's a Mk1 fiesta ? With a sub 1000cc engine, no matter what exhaust you put on it, it's always going to sound like a 4pot fiesta. 957cc is the Valencia engine, so all you'll be able to do is put an air filter and exhaust on it. Theres NOTHING about to make them go faster. So it'll always be "slow" But they look SWEET slammed with minilites.