Mine is totally stock as kinda a big FU to a buddy of mine. He got the same truck as I did, except the Dodge. In 2000 Dodge had a 5.9L pushing 235hp with a coil and distributor still on it. He started changing the exhaust etc etc and asked me "when are you going to mod yours?" My reply "As soon as yours is faster". It's 2012, we both still have our trucks.
He's done
Dual exhaust (currently rusted off)
Running boards
3 transmissions
Rear axle (diff exploded)
Brake lines
Front end (damn near everything up there)
5 sets of brakes
Few other things..
Me:
I changed the plugs about 100K
1 set of brakes
1 drive shaft (I bent it pulling a forklift)
1 K&N air filter (when I needed one, it was early production and no one had one except K&N)
I'm still faster