I am/was in the exact same boat as you and I flipped out after finding out about all the epa BS. I scrambled and spent over a grand on efi live- tuning -5 way switch, trans tune and the edge monitor.
I found a few people with efi live autocals and tunes on (insert auction site here)....
I have yet to install the efi live as the truck has been getting all new front end parts installed but the tuner is next.
I will keep you posted- but don’t fret, there are several companies north of the border that you can still turn to.
Epa- GO TO HELL!
Try regulation on shit-sludge, bunker oil burning ships that pollute the earth more than all the vehicles combined.... assholes!
2008 Gmc CC 2500 6.6l- deleted, 5inch exhaust- cold air box intake- FASS - tuned but no clue which one! 130k miles and hauls balls but guzzles the green.
Just bought CTS2 and EFI LIVE w 5 way switch- in the mail!