That was absolutely an oversight on my part, and was truly embarrassing. Didn't check the filter (it even has the filter minder) and was towing the boat with a truck load of people up a highway on-ramp. Boost starts kicking up, and then *zero engine noise* except for the spinning of a turbo. And then it takes off again, and does it again. Limped back and got a buddy's truck and went fishing. I am probably in the "change it too often" group now.
It's been a long time since my diesel ran a stock intake. An aftermarket system will definitely add some power even to a stock engine. And with those oiled filters, it's definitely good to clean them every 10K miles or so. Even 5K miles isn't too often. On one dyno session the filter didn't look particularly dirty but cleaning it was good for about 25hp.
