st170 front set up, grooved and green stuff pads, rear discs and calipers off sierra xr4i ... had quite a lot of probs bleeding the system, ie bad pedal. make sure all of your brakes other system is in good condition ie servo master cylinder hoses etc.
i also have stainless steel goodridge hoses.
after 500 miles of bedding them in and then a track day they are awsome, however the rear end is a bit twitchy under sh!t your pant braking situations lol but controled brakeing is very good.
cost £210 for brand new st170 calipers from this bb, £144 for grooved discs and green stuff pads.
i had brand new rear pads fitted as well as that gave a much better pedal feel as it was a bit low.
ive also fitted a brand new master cylinder and servo as mine was leaking a bit