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Mine used to move to the left just like that. My problem was the bracket that Charlie fitted ( small black triangular rubber) - The ehxhaust was expanding and moving back - It didn't have enough travel and once the bend in the metal hit the black rubber bracket it was pushing the exhaust left and down and causing it to catch the surround.
I just drilled another hole to affix the bracket a bit further back, giving the metal more room to expand along a horizontal plane. Now it doesn't move anywhere - dead central.
went back to prospeed today, they moved it over to the right lots and when it heats up its in the center. drove all the way back and there was no melting of the new exhaust surround charle brought me and covered my toll/lunch.
cool - glad its sorted - does it seem quicker again now? if its any consolation my 172 feels slow as fook at the moment due to this hot weather - reckon im losing about 20bhp by the feel of it!