But noone has reached 100,000 miles on these gears! Do you demand to know if new turbo kits will last as long as the stock ones did? How about injectors? Your demand is rooted in your ignorance. If you want to know whether they will last as long as stock gears on a stock valvetrain versus BDE gears on a Ferrea / JWT valvetrain, enjoy the wait because it is going to be a long one.