I WILL BE PUTTING ON A 12FT CAMPER AND PULLING ABOAT LOOKING FOR BETTER MPG WHAT SHOULD I DO? LIVE IN CA SO I NEED TO UNDO WHAT EVER I DO IF I NEED INSPEC I FLANGED CAT KN IN STOCK BOX WITH HOLES WOULD LIKE TO PUT A MODULE WHAT IS BEST WITH STOCK TRANZ AND NO GAUGES NEED HELP ERG REMOVAL?????THANKS

 

see if there is any info here to help you https://www.dieselbombers.com/5-9l-c...n-cummins.html

 

Do some research on carb appoved 4" exhaust and cold air intakes. Helping the truck breath is the first thing. Then if you want just milage I'd look into a Edge Milage Max. They claim it helps mpg and has no smoke. Tires at max psi for less rolling resistance. Synthetic oils in the axles and transfercase and engine. Above all just be easy on the go pedal!