Maintainance is high on an S3 but probably higher on a car tuned outwith its design peramiteres hence u need to upgrade all the running gear as well as the engine , also a bog standard S3 with a decent map n a Miltec etc is still above a highly tuned 1.8t quattro and has similar insurance costs, where the sport will have a big increase in premium after modding, as it may move up a few groups IF you declare the mods, think the 1.8t quat was old group 17 and the S3 a 19 , but when i did my homework it equated to a £40 difference on a fully comp policy think a faclift S3 is now a group 33 dunno about the other models , lets face it the 8L facelift is the teenager of the Audi a3 full of bravado and ready to go in all combat, the the 1.8t is the nipper , the 1.8t quatt is the gettin a first **** stage , and the 8p is the daddy .. so why buy a car and try to make it do what its older brother does when he has already learned the mistakes of its sibling ... S3 is the dogs ill be having me an 8p very soon