2001 5sp trans cummins motor.Motor is bone stock.I would like to upgrade the exhaust to a Diamond Eye 3 inch. straightpipe turbo back.What airbox should i use?Which programmer?
I am looking for a better sound along with a little more hp&torque and better fuel mileage.
The clutch has been upgraded..Don't want a race truck or a big smoker.Just a little more hp&torque along with better fuel mileage..Looking for good advice and proven products..
Thanks in advance

 

Go with a 4" Exhaust. Before I added anything else you need to upgrade your lift pump to your VP44.