Jakes and high boost?

[Nilao]

Just hit 20k miles on my Inframe. 7.7 mpg last tank. Waiting on oil consumption to slow up. Made it to 7000 miles on first gallon of oil and 8000 on my second. Full engine brake on my 871 peaks at 28 psi but the 2250 is a little different so I can't say but I wouldn't think higher boost than you would see at max power on a grade would be right, but then again you're just compressing air and not combusting fuel so it's probably fine. They do advertise it as a 600hp engine brake.