Erm, its not a lot different to your NA....!!!!!1
Faster, yes, other than that, there is not much more to keeping a TT.
Air filter- same place and size as NA
Spark plugs_ ^ like the NA, but much easier to change, but watch the coilpacks and clips which sit on top, whereas the NA has a dizzy
Oil filter_ in the same place, but not as easy to get your hands to.If you move the power steering reservoir out the way, it becomes much easier.
Gearbox fluid, etc are all the same and in the same place.
Extra performance doesn't necessitate greater expense nor difficulty. You will be surprised.........enjoy.