I run a 15/16" lightweight m/c from dr diff on my Duster and now my Challenger as well. The challenger was converted to manual brakes from power. The 15/16" bore will create a little stiffer pedal than a larger bore, but it also produces a higher line pressure. IMO the 15/16" is the way to go. The pedal effort isn't bad at all, and the braking feel and responsiveness is great. My cars are my daily drivers too, so they get driven in all conditions, traffic, etc. The manual brakes aren't a problem at all. After converting the Challenger to manual I don't think I'd run power brakes on any of my Mopars again. And it's not a small car.