That shredding has to do with the alignment and that stock tensioner. Some are going to a dayco. If you're going to really spin blower , that's where a separate front drive helps.
Magnuson/Arrington sent a new set of tunes to try out the box- 393 first hit, little fuel adj, 398. What I was expecting. Adjusted shifting firmness a little as well. Now is does what I thought it would be doing from out the box. Definitely a big difference from stock. Very pleased with the result. Strange thing on that first primer tune, but wow, yes, nice blower and good umph.
Thanks to Magnuson for getting the tune correct, and thanks to SHR for a clean install and helping work with me and the blower tune on their dyno.
Now to sneak a race with my bro in law in his new R/T truck.