TruckinAin4Sissies
L.E.D. Whisperer
The tow/haul mode is activated when a wire on the 411 pcm is grounded. It can be wired to a switch on the dash. If I remember right it just selects which of the two sets of maps to use. The stock PCM does not have this mode, thus the swap.
The swap also allows for better boost tuning and higher rpm range.
Sent from my PG86100 using Tapatalk 2
Yeah, IF he swaps over the 0411. I think he's still black-box.
-Truckin-