FIRESTONE kit is easy to fit but most fittings have been replaced due to factory leaks; with plastic ferrule and brass ETC tee now, NO leaks. {ALSO added a tee and installed an air sensor to view, 18psi seems best with no load} The product is VERY good but does not improve the ride and seems to give more road feel which is usually perceived by bumps. RIDE HARD! But no more sagging cheap TOYOTA steel leaf springs. There has to be a better answer somewhere?