I have played around with a number of options on the pre cat +8. Extended the rear pipes but then caught my lower leg on them occasionally when filling up. Extension pipes curving downwards. But the best solution is side pipes. If driving for many hours I wear ear plugs. Had a set made by a company that specialises in ear plugs for musicians. They 3D scan your ear then print the plugs and you can fit different decibel restrictors. Very comfortable and were £90 three years ago.
