I replaced my original Bosch's w/Monarks...nothing short of phenominal! I did the nozzles myself and balanced them, although they needed virtually nothing...every one was well within specs. C Sean Watts has been rebuilding injectors for a nominal amount (+ parts of course)...much easier than the route I went unless you want to learn how to do it, like I did. 10k + mikes on the new ones w/o a hiccup.