OK the tune-up is almost complete on 2002 Chevy 2500 6L. Before the tune-up the engine could barely be heard and the truck had a resonable amount of power, it could churp the tires but seemed like it should have a little more attitude.
I installed a new;
PCV vavle old one was shot, not sure what they do?
royal purple fluid inboth differetials,
synthetic castrol in the transfer case
JBA 8mm wires
NGK iridium plugs
air filter which was in desperate need of replacing
I was unable to do the fuel filter, any secrets to getting that off?
Dealership is going to do the Transmission filter and fluid with royal purple(I can't flush it)

Now the engine sounds better with a more agressive tone, the truck definately has more power.
Next I have Bilstien shocks ordered for it. Once that is complete I want to put a flow master muffler (I want it to sound like a truck) but there is not much information for me on the 6.0L its a duell in single exit stock? muffler currently. Anyone know if Flowmaster makes a muffler for me? Then I will start doing other performance upgrades.

 

Flowmaster makes a muffler for everyone.. A Flowmaster will make your truck sound like a truck, but if you want it to turn heads, install a Performance Air Intake System as well.. Makes all the difference in the world.

 

That and I am pretty sure you can do a true duel witht that setup with out having any exhaust back pressure issues. But I am not positive. Also that intake will really help with the engines performance.

 

you can indeed run true duals on the 6.0s if you want to and you shouldnt have any low-end issues

 

oh and btw two flowmaster 44s sounds absolutely amazing on the 6.0l engine... just throwing that out there