Quote:
Originally Posted by Boostaddict
They are both significantly better than stock. You can't directly compare the materials, becuase they are completely different processes. 300m is a through-hardened material, where as the quadco xr is through hardened (softer) and then case hardened. I'd go for the nbt one just because of the rust preventative plating and the fact that they were developed by an actual 3S vendor (cheaper is just a bonus).
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Even though they are different processes, you can still compare them. Has there been any destructive testing (Charpy V-notch test, Nil Ductility transition test, drop weight test, etc; yes, I know these are unlikely) done on the two materials to give a strength yeild? I know the corrosion resistant coating is a bonus but how much rusting do you really have on the splines of your stock output shafts? I know I have some small amount but it is minimal so I'm not sure the corrosion inhibiter is absolutely necessary. To be quite honest, I'm not really sure which to go with, the Mark Williams output shaft is more widely available (easy to find at Supercar) but then I've heard a lot of good things about NBT; price is a concern but I'd rather just go with the better of the two.