hey richy b i found some info on tuning 1.3's apparently you can fit polo gt pistons for a compression ratio of 11.5:1 with a 0.5mm re-bore, get a high lift/longer duration cam, gas flow the head and get a weber carb. use a pole g40 exhaust manifold and matching front pipe into an gti 8v system. the manifold is so you can fit a bigger bore exhaust but you will need to modify the hot air pick up for the carb or you we get probs in cold weather. this will also keep your engine looking standard' but should be good for upto 1oobhp