fzrace said:What makes one brand of brake have more stopping power than enother?
Stopping power is purely a function of backpressure. More = More. You can only push backpressure so far before you flaot your valves though. The most noticeable diffrence would be in the new pressure relief exhaust brakes being able to hold the pressure up higher at lower engine rpm's where they drop off with the older style.
-Scott