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.
If I have to go this way that is a good tip.
I have leak tested the exhaust and found a good few leaks, I obviously used too little paste on the joints either side of the cat. I've re-done all the joints and it leak tests OK. T'was a bit too wet here yesterday for a test but might be manage a test run today. I'll let you know the result.
Cheers
John
