ms3 or ms4 hp?
Its hard to say with out knowing all your mods, With what you have mentioned there 375 is possible with either cam. MS3 is what I run. I would recommend doing supporting mods such as headers full exhaust, Lid, ETC. Dual valve springs and timing chain and oil pump also almost a necessity.
If you have LTs either way you will hit 4+ rwhp but if you are running N20 I think you should look at the MS3 at 113+. I think the MS4 is more of a motor cam and the 3 is more of a N2O cam. If these are the cams you are looking at. Good luck.
without full supporting mods that cam will not reach its potential. you need intake exhaust blah blah blah and lets not forget the springs and such. without those bye bye motor
i know that i need springs and other things. When i put the cam in it will also get Lt and true duals.



