I have spec twin disc with aluminum flywheel the clutch engagement is great but it does make some chatter not at engagement but when you first depress the clutch about the 1st inch of travel but only. Not loud in the car with radio on no one could hear. It has very good pedal feel and modulation. I put about 500 miles on it till the brand new slave cylinder popped. Told it happens time to time shop will redo on them and ford will credit for new slave, but have to tow the car their... I didn't get a chance to use at the track but next month hopefully weather will break we've had over 60 inches of snow!