Sent box to MSD week and half ago. Never hear anything so called Tuesday, was told they just sending me a new one that is policy. Come home today and found they shipped my old box back (not in the original msd box I shipped it to them in), paper work said they testing it at 4000 rpm for 8 hours and everything was fine. Guess 4000 rpm is considered high rpm. Will call tomorrow see what they say. So far thumbs down on customer support.