Fitted a new ford clutch to my brothers escort cossie today because it was juddering not slipping, when i removed the old clutch the flywheel had loads of blue hot spots on it so had it skimmed and fitted new ford clutch problem now is when it comes on boost it is slipping the car is not chipped the only other thing i changed at the same time was removed standard exhaust with cats for a magnex full system can anybody shed any light on why its slipping?