Yes reach out to CR Performance. Thats what I did and how I ended up with the stage 4 turbos as well. Andrew is the man to talk to.Outstanding results, it’s nice seeing some hard numbers from a turbo upgrade. I bet the truck is very fun to drive. I like that MPT kept the torque low to preserve the drivetrain. What psi are you hitting at max boost on your tune?
Also, I didn’t see a stage 4 setup on CR Performance’s site, only stage 3. Did you reach out to them directly to discuss different options?