ok, buying a moser 12bolt to match up with abs and all the other features i need. but whats your opinion on the spline count? 31 is standard, but they sell 33 and i think i seen a 35. is this a must for high hp applications?

 

If the car's an auto you should be fine with the 31 spline axles, however I would just upgrade to the 35 for piece of mind.

 

You won't need more than 33-spline unless you're pushing 1000hp.