8v and 16v flywheels are different. The 1.8T's clutch can be uprated to a single mass flywheel using the G60 flywheel and VR6 clutch I think, there's plenty of info around the forum especially in the mk4 section. As far as I know for clutch quality, an OEM one will handle the standard 150hp with no problems, but if you're looking at 250hp you want something aftermarket. Sachs do one of the best clutches out there.