The natural order of Modifications.
 

So rule of thumb theres gotta be some general order for upgrading your Cummins. Like intake first then exhaust etc... I would like to hear a couple opinions on what kind of order people did their mods what brands of what they used and how its treated them so far. Im sure theres alot of people that have alot of experience with stuff they purchased and it turned out to be junk so I would just like to hear some peoples opinions. Looking to start spending some heavy money on mods in the near future and id just like some back round knowledge. Thank you.