Just a thought, but you say your back box needs to be at least 3 inches in/shorter than its present position and your down pipe to exhaust is 75mm a drift? Would it not be possible to cut the 3inches out of the straight pipe and then attach/ lengthen the upturned front section by 75mm, I am joking with the metric imperial but serious about a cut shutvand lengthen. Actually surely it would be possible to alter the bend at the front to get the length to down pipe and that would also solve the long back box problem too. Ed
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