Thats a good question 4ontheFloor ....... and one that I can't answer (yet). He (my buddy) got the idea from Mile High Classic truck parts in Denver, and we followed their instructions. I'll give 'em a call on monday and ask and post the answer. For what its worth, he's been driving his truck in the Dallas/Ft Worth metromess for over a year now, and it's still working great.
