While I can't speak to the quality of Bosio Nozzles, I can speak to the quality of Monark nozzles. I just installed the DNOSD261 equivalent nozzles and WOW, what a difference in running quality!!! Seems like more power off the line, and quicker throttle response. Definitely idles more quietly. Has more of a diesel sound to it when accelerating - which I like. They were on sale at ************** for $99 (set of 5).

Having installed this nozzle version, I would not go back to the original DNOSD240/ Bosch nozzle.