I got a another Escort RS Turbo and its kicking out in the region of 200BHP but i find that sometimes the revs go more higher than the car when i really put my foot down is this because the clutch is slipping. Its a standard clutch is this why its happening and also i find when i go pass the 4500 RPM mark the exhaust gives a screeching sound off and sounds like the car is wheel spinning which in actual fact its not. Any ideas?