which one is better i understand both have clutches..
which one is more durable and can handle more shock
how often do u replace the clutches how much does it cost to replace the clutches
how often do u change the diff fluid and can u use any diff fluid?? (redline shockproof, oem honda)

 

im probably going with the cusco. If you did a search you'll come across people having noise problems with kaaz if you dont use their fluid. cusco has two types of mz and rs that both have 1, 1.5 and 2 way. mz being more suitable for road racing and rs for drag.