i was running an unboostered 7/8th(240k)....got over it and added a booster in as part of the latest brake upgrade alot better for the street now that it has a booster, but i think i'll soon be upgrading to a 15/16th to get rid of some pedal travel. got 300zx brakes all round and they run a 1 inch or 17/16 from factory so i think the 7/8th is a bit small