dont waste your time on the 2.8 supercharged.....2.7 is a completely different monster. For the price of b5 s4 going down every time its not worth doing the swap, instead just sell your 1.8t and buy the b5 s4. Maintenance on the 2.7t is a bitch, there is little to no space in the engine compartment to work around. I love the platform and thats why i ahve owned two b5 s4. BUT i ahve also owned two 1.8t and maintennace is way cheaper and easer to work with. If what you really want is go fast and dont spend so much cash, just build the 1.8t. you can just drop rods with stock pistons and a gt3071r and a good tune and you are set. If you really wanna go FASTER go 2.7t stage 3, meaning k04 turbos, but with this decision requires deep pockets.

just my .02 cents