Go for it...new-style headers will actually lower head-temperature and make it breathe easier. Bigger intercooler will also lower intake-charge temps and make it at least as dependable as it was. Stear clear of 1-bar boost spring and buy yourself electronic boost controller. It's much easier swap, you can always lower boost and you don't need to mess with wastegate or get dirty.
Are you going to drive it or are you just going to look at it?
