I'm looking to upgrade to 5 lugs here in the near future. I've been looking at various kits and most all of them include 28 spline shafts. My car is mild right now but I obviously plan to build it up more. My question is how much HP/TQ will a 28 spline axle safely handle? I'm pretty sure that I will end up getting 31's anyway but. The car will see the track but will be more of a street car than anything else.