I installed a 4" mbrp turbo-back and am running the quad stealth 2 w/ 50 hp tune. The engine know vibrates more and the dash is ratteling, which has not happened since i first purchased the truck. Has anyone noticed this also or have any input?

The dash rattle, yes. I don't have aftermarket exhaust so I can't chime in on that one.

The tuner and exhaust created this??

I have the dash rattle on initial start up when cold and until around 180 degrees on the factory gauge.