K&N filters
Anyone changed there factory air filter to K&N?If so was it worth the cost i.e. improved mileage?
Forum Discussion
Not a good thing for a diesel. Test show that the stock filter for the duramax is the best one out there. In the test K&N let in far more dirt which will foul the MAF sensor. I had one in my gasser Tundra and saw no real improvement. I went back to the stock filter.
