Thanks Mark, That job had already been done by another garage. Long list of parts also that had been thrown at this car by them as well. I found that it has twin cats (why?) and the first had completely broken up and pieces travelled along to the second thereby partially blocking/destroying it. Fitted new second cat so far and it's a different car. Cant help thinking that there is still a very slight lack of power/hesitation at the top end though.Maybe i'm just being fussy, after all it is a Daewoo! Regards Colin.