hello there! i just purchased one of the last 126p's ever built, its a fiat 126 town and is a 2000 model. it is obviously polish, left hand drive, and air cooled 650cc. i would like some advice on how to give it a little bit more ooomph

, however DO NOT WANT AN ENGINE SWAP and want to keep it AS CHEAP AS POSSIBLE!

its in quite good condition and has fso alloys?
i fancy putting some type of motorcycle exhaust on it, is this a good idea? just to make it sound better. as sports exhausts are rather expensive for such a short system :O !