Before spending money on modifying your air intake
you might read this article from 8-Lug Diesel Magazine
where they correctly compared
new paper filters to new CAI
instead of playing the very common trick
of comparing an old dirty factory air filter run for days on dusty dirt roads
to a new CAI:
In terms of 'effective' mods, take a clue from engineers at Chrysler Tech Center.
Dodge has gone to 19.5 tires
on the new 3500 Cummins Cab/chassis with Aisin 6 speed.
It is worth studying up on the pros/cons of these tires
their lower rolling resistance and long tread life boost fuel economy and performance
but their wet/dry braking is slightly less.