Recently took delivery of a 2002 3500 QC Dually 4x4 Auto with 4. 10 Locker- It has towing package , 47RE with aux cooler and everything but leather- I immediately put in Edelbrock IAS shocks all around and WAAG Dually bars which extend all the way around. Put a K &N in the stock airbox (well sealed with grease)- put a quick 5k miles on it and did first dealer oil change (free) with Mopar 15w-40 at 3500 miles- I was dissappointed to see at the Cummins site that K &N is not recommended but I ran this truck on the beach in deep sand during a windstorm at the Outer Banks NC (50 lbs of air!!!) and checked box was clean so was filter- I would like to go to a Volant and a 4 inch dual exhaust system to move more air /exhaust and a gauge package- I am also putting on some of the ATP sound reduction parts because I daily drive this and put it in a parking garage next to really little cars- Woud like some comments suggestions- I would hate to void a 100k warranty but these filter makers must feel the units can protect an engine- sorry for the long post but I am new.