Cowboyvulgarity

Hi, I am experiencing the same issue among a few other things. I have a 2015 gmc sierra with the 6.2. Something is going on electrically, and I just dumped $ 2500 in an attempt to fix it between two shops (dealership which is cheaper and they throw me discounts due to my cousin working there, and the other at an electric mechanic shop). The same issue is still happening and actually getting worse... Symptoms: Timeline note: I put Borlas (s-type) on the truck, and that's when these electrical issues started happening. No welding, they come pre-welded. 1.) navigation was zooming in and out on its own, and picking areas as if we touched the screen 2.) often the touch screen no longer responds; if I kill the engine, it sometimes comes back and is responsive 3.) my transmission gauge temperatures fluctuate erratically, by 3-10 degrees either direction continuously 4.) after the dash was updated, it went black with some lights - GM engineering said it was circuitry damage; ordered the part 5.) truck wouldn't power up; replaced the battery and it's now working 6.) replaced the dash, and now my windows won't drop when I hold the unlock key; all the previous issues (1-3) still apply I love this engine and this truck, and my heart is really not in getting rid of it just yet but these repairs are killing me and they seem to be making things worse. Any help is appreciated... I'm otherwise just going to suck it up and dump the damn thing. The dash and radio replacement did not fix anything, and the truck overall is getting worse... Any thoughts? Thanks, Aaron