Looks like there is a coolant filter and oil charge kit installed, and hard intercooler pipes.
The 2004 model had metal intercooler pipes from the factory.
That is probably an oil bypass filter. This is a good thing as is the coolant filtration system. Sounds like the previous owner knew a few things about this engine.
Truck has a 4'" turbo back, SCT tuner with DJ diesel custom tunes, EDGE CS monitor, 8" fox 2.0 dual reservoir suspension, 20" WWC Black widows with 37" Pro Comp tires, billet grill, backup sensors, HID headlights and blacked out taillights. And then there is this black switch that revs the engine to 1200 rpm when in neutral as long as the brakes are not applied. So basically im just trying to figure out where i stand and what should be some of my next mods? And also what is the purpose of the black switch? ( i just use it to warm up the truck when its cold in the morning lol).
Your black switch is a "high idle mod." It is used for what you are using it for. It is also used during periods of extended idling to prevent "wets stacking."
I plan on pulling the rear diff cover this weekend and seeing what gears i have back there as the cover seems to be different then stock. also i was curious is there was a way to tell if the head studs have been done without pulling the heads?
Check out the head bolts. If you see a bolt head, they have not been done. If they have a nut on a stud, they have been done.
Any help or guidance would be greatly appreciated! Sorry for the long drawn out post that probably doesn't make any sense but im just really wanting to just dive into this truck because i am a very fast growing enthusiast.i attached a picture of the truck the day i bought it.
On your CS, you should be monitoring your coolant temp and your oil temps. This will allow you to keep an eye on the health of your oil cooler.
To really test it, get the truck (unloaded) up to normal operating temps (190°F coolant temp, give or take a few degrees). Find a flat section of highway, set the cruise for 55-65 MPH. After a few minutes of cruising at that speed on the flat, check the temps and compare them to each other. Your oil temp will be higher than your coolant temp, but it should not reach 15°F in this condition. If/when it does, it is time to replace your oil cooler and replace (or delete) the egr cooler. Always replace as a pair if you decide to keep the egr cooler.