Swamps has been tuning since almost the beginning of diesel performance. They know their ****!!! I pulled using the extreme race tune, which is usually calculated for most trucks at an extra 140 crank hp. At the time I got the chip I had no idea Id decide to pull, hence why I dont have a sled pulling tune. Other than the chip all I have done to my truck is a afe stage 1 setup, obviously straight piped, and had some mods done to the trans when I toasted 1st gear 2 years ago. Which all that was done to the trans was a rebuild, that ended up adding a clutch to each pack and a Transgo Tugger kit. Trans has me really impressed for the few mods it has.
Ironically though on performance and economy I get the best of both with the extreme tune as long as Im not hot rodding all the time. That took me a couple of weeks to get that out of my system!!LOL Once I didnt floor it all the time, my fuel economy went way up from what it was and still have plenty of power on tap to get my 8000lb truck moving! Eventually thru working for dealerships getting to know all the engines Id like to get into the diesel performance side of things. Lots of money to be made there!