Join Date: Apr 2008
Location: A little house on the prarie, NE
Yes it does. Thats how all three of the brands/types I mentioned create the backpressure.
With EFI Live it's programmed in such a manner that it doesn't come on during normal driving, but when towing it will work in conjunction with the tow/haul mode and the downshifting that the allison does. I don't know as much about the Fleece or Banks unit, but I do know that the Banks unit is very effective. Can't comment on the Fleece unit.
Jesse 2004 LB7
Lots of miles
Built by Husker Diesel
1995 Chevy 2500 - 12v/NV4500 Swap