I have used the Smarty on the 100hp setting and everything worked well (little too much smoke). But when I tried the 70hp setting the cruise control was surginging slightly, I disengaged the cruise and then reset the cruise a couple of times and the surging seemed to go away. It does this on every trip. It did not do this on the 100hp setting. I haven't tried the 40hp setting yet. Has anyone else experienced this?

 

Mines done it since the day I bought it when it was bone stock, although Smarty does accentuate it a bit. Sometimes I dont even notice it.

 

The Smarty surged like crazy on mine, it also wouldn't hold steady RPM's when the high idle kicked in. Back to stock, or juice, or juice/predator stack there is no surge.