Small update, last week started changing rear discs and pads, first disc locating screws were rounded off and seized so ended up just changing pads. then decided to swap my UK manifold for the larger bore jdm one id just bought, took it off, went swap decat over to discover they wouldn't mate up. so had to put old manifold back on. tightening last stud and................ yes it snapped.
this week i bought a larger decat, drilled out the screws and changed the discs, took the manifold off to find part of the stud stuck out so managed to get some grips on it and twist it out. so finally managed to get the larger manifold on.
just waiting for my 20mm all round hubcentric spacers to be machined and i can fit the 4 pots