Efi is the way to go. If youd like pricing email me. That being said the ppe is the best "canned" on the market imo.
I have the same truck as you with 260K. PPE downpipe, K&N intake, 4" exhaust, 265s, and a 45 gallon RDS fuel cell/toolbox. Tuned with Kory's tunes DSP5 switch and I tow a 6,000 lb 5th wheel.So I have an 06 LBZ that is bone stock engine / trans / exhaust wise. Its paid for, has 123k miles on it and I use it to tow my 5th wheel.
I was waiting to have a couple grand saved up and get it tuned with EFI Live Idaho Rob trans safe tunes with the DSP 5 switch, and do a 5" exhaust with muffler since I travel to Boise once every other year for work and thought hey I'd drive my truck out this time around and get it done while I work my conference, then get to enjoy driving it back home.
However, now that they have been shut down from the EFI live tuning, coupled with a second kid on the way, which means tighter finances, I'm kind of at a cross roads on whether I should even tune the Dmax or not? I really don't care about a ton of extra power, maybe an extra 60hp and the ability to fix my speedometer since I'm running bigger tires. I really don't want to break anything, that'll end up costing me more $$$ down the road, but at the same time I keep reading about mild tunes that really open the truck up, and make it perform cleaner/better.
I've seen PPE's Xcelerator option: https://www.xtremediesel.com/ppe-xcelerator-economy-power-programmer-111010000?gclid=EAIaIQobChMI1d7Xt5-R4gIVhKDsCh1laQlCEAAYASAAEgJVbPD_BwE
And I've also heard of some other tuners out there, but just not sure if its worth doing at this point or not? Looking for opinions.