The non-ABS cars have 15/16, and the ABS cars have 1". I don't know where the 13/16" comes from. Of course, i don't have CAPS running, and i've had a lot of wine

The 3G Eclipse uses a 17/16 and it bolts up to the booster. You'll have to make new lines to the prop. valve though, but it's not hard. I put one in when i went to the Porsche brembos.

The larger master will make the pedal stiffer, and reduce the travel required. You'll be pressing harder, but the pedal will move less. With the 17/16 and the Brembos (which are super stiff calipers) the pedal is rock solid. Once the pads touch the rotors it barely moves at all no matter how hard you push. It makes blipping the throttle with the side of the foot under brakin verhy consistent because the two pedals are always in the same spot relative to eachother.

www.car-part.com to search wreckers for them.