The 016 is a decent gearbox but it does have several drawbacks. Supply is dwindling, 99.99% of the parts in it are not available anymore and aftermarket support is non existent. 5th gear is not supported and tends to flex under abuse which results in a stripped fifth gear (and since you can't buy a new 5th gear..). It's max torque rating in a racing environment is 350-400 ft/lbs. There have been many examples them stripping third gear and first gear at these power levels.