Bad news !

Im looking for advice, my cummins started making a loud ticking noise, it was never hard to start,didnt smoke much,or lose any power. I believe an injector has gone south and will know tomorrow if im correct,(the truck is being diagnosed by Area Deisel Service in carlinville il.) if in fact it is an injector do i replace just the bad or all of them, price wise i would prefer to only do the bad one and possibly put like a 25-50 hp nozzels on all . I realise its time to fix the poor factory filtering with a fass or air dog type set up if i choose to upgrade the nozzels has anyone had a similar issue. The truck is a 05 2500 cummins six speed with 60k miles

Im looking for advice, my cummins started making a loud ticking noise, it was never hard to start,didnt smoke much,or lose any power. I believe an injector has gone south and will know tomorrow if im correct,(the truck is being diagnosed by Area Deisel Service in carlinville il.) if in fact it is an injector do i replace just the bad or all of them, price wise i would prefer to only do the bad one and possibly put like a 25-50 hp nozzels on all . I realise its time to fix the poor factory filtering with a fass or air dog type set up if i choose to upgrade the nozzels has anyone had a similar issue. The truck is a 05 2500 cummins six speed with 60k miles