X2.
Additionally not all gun drilled axles are equal. The heat treating process is much more important. If done incorrectly the axle can be more brittle and negate any of the advantage of gun drilling.
Some of Baja guys run 40 spline 1 pc axles (both wheels mount to 1 single axle shaft). The added rigidity of the 1 pc shaft will cause accelerated R&P wear if the shaft isn't gun drilled. Another reason you'll see lightened parts on these trucks is unsprung weight. Despite some of the parts these guys use on their trucks, they still try to keep the unspring weight down if possible. I have 40 sp shafts and I can tell that these mofos are HEAVY!!
