Pulled my 535 exhaust too many times to count. Martin has convinced me it's MUCH simpler to not try to 'unhook' the donut hangers in the middle. Simpler to undo the nut above that holds the donut hanger brackets and then push the bracket back/forward with a screwdriver. If you use a small 1/4 socket wrench, it's simple to undo the nut.
I never could find a good way to undo those donuts. Tried the jack method, screwdrivers, you name it. All I did was curse those *%# tabs and tear the hangers.
Undoing the bracket nut is muuuuch simpler.
Jeff
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy