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Should be find if you remove it before taking it to be serviced

Always a good idea to use a battery tender if any vehicle is going to be sitting for a while.

All actual tuners will require an unlocked ECM. There are some piggyback "tuners" that modify the signal going to the locked ECM. No doubt there is less options with that setup.

I now have an unlocked ecm and HP tuners. Yes, you can change the speed limiter with HP Tuners. Be sure you have tires rated for the speed set.

Yes OP it will be fine to run like that. The throttle body is the only thing that might affect the tune. And that's a might. Most likely the bigger TB will only affect how sensitive the throttle is. Doubt your getting any real power gain from it.

I've had HP Tuners for some time. I used it to tune my 07 Vette. Well I've taken the plunge to tuning my Ram. Ordered an Unlocked ECU from HP Tuners and "The Tuning School" course on Hemi tuning.

Stage 8 locking bolts

Shorties won't need a tune. Kooks has a set of "expensive" long tubes & Y pipe with ultra green cats that they clame won't need a tune.

Also (With GM) the last known fuel trim will be carried forward at WOT. No doubt Chrysler does something similar.

That's true about WOT. I found on my Vette that the stock calibration was way rich at WOT.

Could be piston slap. High performance engines tend to do this. If it goes away in a few minutes don't worry about it. Pistons shrink when cold.

Just put it on the stiffest setting. I pushed my truck the other day to where the tires started protesting. Handling was very neutral. If it traction had broke it would have probably been the back end. Which is preferred IMHO.

The stock exhaust manifolds on the Hemi look very restrictive. I bet even shorties will be a big improvement.

I've tuned my own Corvette. The ECM can compensate for plus or minus 25% fueling. Headers don't need tune unless they significantly change the distance of the O2 sensors from the stock location. Tune would be optimal. Which is why my Vette don't have long tubes (it has shortys) as my ECM...

Kooks advertises a set of long tubes that don't require a tune. Very expensive though.

Your are not likely to lose TQ from a cat back, might not gain anything but sound. Putting too large of primary's on a set of headers yes. It's about exhaust velocity not "back pressure". All back pressure is bad.

Did you have any clearance issues OP?

10.9:1 compression. That's a lot for 89 octane under stress IMHO.

When I do it, I will go with Corsa Sports. No way I'd put "Dronemaster" exhaust on my truck.

OP said it's a Highway Queen. You are describing an off road truck.