gary85...I was going to have one insalled at Quartzsite, pulled in for my appointment, but they didn't have one in stock.
I'm glad they didn't. I did a little more checking and found that they really only work at low RPM by blocking off the remaining hole in the PacBrake plate. If you're like me, I wanted more braking at 55-60 mph. The new unit only helps at low speeds. I have enough braking at low speeds. Hope this helps.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor