Hello again!
Yes - the clearance between the steering arm and exhaust seems to vary. My nearside (driver's side for you) clearance is less than the other and my son has watched the steering clonk the exhaust. I put some electrical black tape round the steering arms so that the clonks are now tape on metal rather than metal on metal. Only real solution as far as I can see is to bend the exhaust pipe down further but this is obviously easier said than done.