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yeah real helpfull there
ill put it more directly for the people who want to be smartass about it
Will the 2IS F sport brakes bolt on to the 4GS
Hey, yes i've done the bbk from the is250 option. The fronts bolt right up to the knuckle no problem. Rears that's where i had the most trouble with. Since on our cars the rear calipers bolt towards the front of the car, on the IS's they bolt towards the rear. That's where the difference lies. So that being said, if you do decide to get the rear calipers, you can call up stoptech and ask for "their version" of the bbk and order the brackets that bolts up to our cars. The brackets bolt right up to the rear IS calipers perfectly, but the trouble lies clearing the backing plate of the rear knuckle.
You need to find a machine shop to plug up both caliper bolts and move them exactly 8mm inwards. then you need to mill down the excess fat to clear the knuckle and then bolt it up and bleed normally. All the troubles and problems are so worth it once you finally finished and get it on the road because the braking is good stock....but the braking on these are a world of difference.