Yeah but in the instructions that come with the 2.1 it says you can program it to be just like the 2.0 if you wish. It has a selector dial on it, I use postion 1 for my 3.55 gears and stock tires.
I fixed my problem thanks to the OP's pictures which are way better than the ones included in the...
follow the URL, almost at the bottom you will see a user with the name "INNOVATIVE DIESEL" say they will swap. I noticed they jumped the price on the ID website 50$ since last week.
http://www.powerstroke.org/forum/6-7-performance-parts-discussion/225512-torq2-mileage-question-3.html
new user...
From what I have seen on other sites, ID will replace your torq2 with a 2.1 for free just call them.
I installed my 2.1 yesterday seems to work fine, however I think I spliced the wrong wire. I managed to cut off my reverse sensors. It looked like the red/yellow but I have bad eye sight. Still...