Hi Guys just bought a as new 05 4rt

Want to Upgrde the Master cylinder

Is there a difference between the 315 cylinder

and the Large bore 4rt one the sandifords sell??

P.S any particluar age of 315?

Thanks Marty

Hi, I just bought one with the large reservoir. I thought it was the one with the larger bore, but it wasn't. It made my clutch feel strange. Didn't care for it at all, went back to stock. I took the seals, etc out of the new one and put it in my original to freshen it up, so this also confirmed the bore was the same. I guess you have to get one from a 315 to get the bigger bore? A bit puzzled myself. Let us know how it works out for you.