I had a lighter and more finely balanced flywheel in my GTI.
'Advantages: Significantly improved responsiveness - gets up to speed much faster!!'
Disadvantages: After prolonged and extreme use, it started to slip (BERGRENNEN - likely referring to a slipping or peeling issue).
and reduced engine braking effect!
The most important thing in such an action is the fine balancing of the modified swing, otherwise you could damage the crankshaft, etc.
