I have the JWT lightweight flywheel installed. While at idle it does produce some chatter and it's obvious enough that people have commented on it while standing next to the car. I don't find it to be obtrusive or bothersome though some might. But my car is more purpose built.
A lightweight flywheel robs less power from the engine, as an engine accelerates through its rev range; a flywheel’s mass requires power to accelerate it to higher rpm. The stock flywheel weighs 32 lbs. My JWT flywheel is 16 lbs. A sizeable weight drop. It takes a bit more clutch slippage to get off the line smoothly but it's really not a substantial change.
The JWT flywheel coupled with the JWT clutch and pressure plate yielded a gain of 6whp and 4ft. lbs. of torque on the dyno in my car.
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