I have a 2022 with the DF Stage II and the back flow valve with 35 inch tires. I run 2400 RPM at 55 MPH and have plenty of torque and power to pass other vehicles when needed. I also have the selector switch and keep it on the high mode. I flip the selector switch to low mode when my granddaughter drives around the yard.
The backflow valve really smoothed out my engine at the higher speeds. I thought my engine felt choppy at 50 to 55 MPH until I put that back flow valve in.
I do think you will want to go to the larger exhaust if you put the RX41 turbo in. But, mine runs fine with DF Stage II and no other engine mods.
