great:
slotted, cryovaced rotors
ceramic brake pads
s/s brake lines
under drive crank pulley
Bosch +4 plugs
Hayden 30,000 lb gvw cooler
atf temp & pressure gauges
good:
K&N drop in air filter
cool blue 9005's
Royal Purple oil, atf, diff fluid
alternator mod
remove air intake resonater