if the turbo is from a TT then you'll need a downpipe aswell as the manifold, and ofcourse chipped to suit, or you wont see much of a gain. Other k04's bolt straight on, can't say for sure which ones are which, but again its not a huge power increase. Full kits like the APR stage III for about 4 grand will kick you up to around 300bhp and a stupidly large amount of torque, but you'll need a limited slip diff on top of that to handle the extra power.