Have a word with Mark at MB Seating in Devon, they make exhausts for Morgans and are also a Longlife exhuast franchise. They made up a full stainless exhaust for our Cooper S at half the cost of a standard BMW one. They have also made some bits for Rosie.
MB Seating If you cannot get hold of them PM me I have Mark's mobile as they are just about to move down the road as have taken over another business with better workshop space.
