i believe the stock function works just fine for my dad's 2006 6.0. he's towing maybe around 10,000 or more often enough & likes it just fine. i might just ask him about that this weekend when i see him.
I agree with Heavy and Turd. The stock Tow/haul feature works so good that I've never had any desire to have an exhaust brake. I haul everything from a loaded down camper to backhoes with no complaints.
Agree with everyone on here my tow haul works so well that I don't even use it with my boat because its too small and doesn't weigh enough to need it. used it once on my way to havasu and it was down shifting and engine breaking when I didn't even need it with that small and light of a load.
True ehaust brakes have always worried me. I am afraid of an exhaust valve maybe being opened (due to pressure buld up) and hitting a piston. If I recall installed seat pressure on our valves is only 80 or 90 lbs. This might not even be a possibility, but has been a concern of mine.
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