It was my understanding too that the Predator could not load custom tunes but it looks like their newer model may. When I was in the market, Diablo recommended the InTune for what I wanted and I thought at that time, it could not handle custom tunes. When I posted earlier, someone said it could, so I revised my post. This link from Diablo shows a comparison chart. The Predator P2 shows it can handle CMR custom tunes but lacks many other features such as "spark/fuel/tuning". Diablo matrix comparing Predator P2, InTune, Trinity
The Diablo units do not stay plugged in. If you think at some point, you may want a custom tune, then I would get the iTune if you are looking at the Diablo units. I don't think the Predator model will allow custom tunes. ETA, below post says the Predator2 Platinum can store custom tunes.
There are some that stay plugged in but most are units that you plug into the port, then upload/download the tune and then unplug. I have a similar set up as you, Airaid MIT, Flowmaster muffler. I have a custom Diablew tune. I used to run the factory Diablo canned tunes but the custom tune is much better. MPG went up, throttle response is better as well as trans shifts. Since you are just looking to turn of AFM/DoD, get better mileage and recalibrate speedo, I would think most of the basic handheld tuners would be fine.
I use DR Color Chip repair kits to keep the stone chips covered. I've used it in 40 degree temps with no issue. I will probably be trying it in sub 30 degree temps soon. They sell a kit to cover broad areas of multiple chips. On one of my previous trucks, I took it to a shop that specialized in chip repairs where the front of the hood was covered with many tiny chips. They made it virtually like new for a fraction of the cost of a body shop. I think some dealerships now offer chip repairs although I don't know if they do it in-house or send it out.
When my dealership runs out of loaners, they send folks over using their shuttle to a nearby Enterprise Car Rental. I have to give Enterprise a CC and they put a $50 pre-auth but when I return it, they remove it and bill the dealership.
Have them check the grounds. When I had a body lift installed on my 2015, it ran fine from the shop where installed back to my work. Then when leaving for work, it started but after 1000ft or so, it started stuttering, then all the warning lights lit up and stalled. It let me start a few times but warning lights were flashing; then it died. Dealer found one of the ground straps came loose and needed lengthening. I had them call the shop that did the lift and they paid the dealer for the bill.
They wrapped them with the bumpers in place. I may have got a great deal as I think I was their first customer with a late model GM to get the bumpers wrapped. It took them several hours to complete the job so they may have underestimated the work required when they gave me the quote over the phone.
I had Performance Tint in Livonia do the wrap and front windows tint. If I recall, I think the wrap for both bumpers ran around $300. They did a great job of wrapping them. I was going to have Notorious Tintz in Livonia do the tint and wrap but they were nearly $200-300 more for the wrap. The wrap has held up better than expected. I've put over 15k on it since the wrap and there may only be a couple of slightly larger than pin head spots where rocks hit it and exposed the chrome underneath. I drive mostly highway and surprised how well it has held up. It goes through automated car washes nearly weekly and see no signs of peeling.
I drive 70-80 miles one-way for work; mostly highway. When I accepted the job, I was driving a 2015 Sierra on a lease. Fortunately, they let me do an early turn-in so I financed an 2018 Sierra so I could put on the mileage my job required. I did not even consider a smaller vehicle. If your financial situation allows you to spend extra on fuel and you love your truck, I would keep it. Just my opinion...
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