My quess off hand is defintly deecrease the life, but my mechanical experience comes from a couple years as a car mechanic many years ago and I know almost nothing about Semis and diesels, except for a few common points.....for example I did suspension work and new when I bought my first 3 axel to climb under and look for rotting rubbler and bad fittings.

You know I remeber in the car buiz too you always saw after-market retro-fits that by-passed this or made this better, and every good mechanic I knew that I was learning from always frowned on them as a bad idea, an engine is engineered a certain way to run, by bypassing it you are basicly declaring you are a better automotive engineer then he was