Sounds like the pipe is just loading up...

the settings from the box are quite rich...you might even want to consider resetting everything back to the original settings (Should be listed in the manual) and then while idling SLOWLY roll on the throttleto help clear the oil and crap outta the pipe it will look like the pipe has been sneezing oil out onto the ground under the truck...

Good luck with the truck...that guy's loss is your gain