I have a 2002 2500HD 6.0 LQ4. My truck is not just a go fast but it is a tow rig. I pull a 10,000-11,000 pound horse/Jeep trailer across the Plains and through the Rockies.
I run a Black Bear tune, 8.1 injectors and Snow Performance water meth injection.
I tow heavy and tow long distance some but it is also my daily driver. Our winter temps get chilly in Ohio if that impacts plug selection.
The speed shops are all about go fasts not long runs at moderate boost 2-5psi.
Should I run a cooler plug? I use the copper AC plugs that ProCharger recommends. Do I stay with the same plugs, what is the experts advice?

 

I would run a cooler plug if you want to run boost but how many steps cooler kind of depends on the power you make or want to make.

If you have no issues with what you are running now then it seems like they are fine.

 

Are you running a ngk tr6 now?

 

AC Delco copper plugs.

 

That doesn't tell us anything. We need to know what the number on the plug is.

 

R 44 LTSM looks to be the plug from Auto Zone's sight.

 

ngk tr6 seems to be the go to plug for up to about 15 psi. most have no complaints with this plug

 

That plug will work with the long periods of boost?

 

Yes, TR6 will work just fine for you. Been a staple for boosted applications for a long time. It's one step colder then the stock TR55's.

 

If you run over 12 psi for long periods I would make sure you check the plugs as you may want a 7. A plug that is borderline on heat range may be ok for some 1/4m passes but extended periods is another story.

But at low boost like you plan a 6 should be fine.