have about 1k on bosios with rebuilt injectors, and better response, mpg and idle, but to be expected with any reputable nozzles and an injector rebuild after 230k miles on original bosch nozzles 100k over due for replacement. have heard good things about monarks as well, but stay away from new bosch as major QC issues and reports of going bd even after 1k. either way, make sure you get the injectors rebuilt to spec and cleaned up by a reputable diesel shop or do it yourself if you have a shim kit, pop tester and time on your hands.