seriously its NOT worth spending anything on that engine apart from a service and adjust the tappets.

it only has like 60bhp anyway (if its running well) and all that exhaust system and filter will do is add noise, it won't go any faster!!!

you could stick a 1.6 or 1.7 puma engine in for not much more with those mods and have TWICE the power and torque of the shite 1300!!

EDIT: don't forget to upgrade the brakes though