Blackrocketrt

2013 Charger rt here, misfiring throwing a few codes. P0201, p2181, p3425, p0300. I figured injector or wiring / pcm. Swapped #1 injector anyways but it didn’t help. Tested all injectors and resistance were fine. Tested voltage coming in and every injector had different reading 14-5V. Brought it to the dealer just to confirm pcm and they slap me with a 600$ diagnosing fee. Cut in half if I pay for the new pcm, programmed, and wiring harness repair kit. 2500 plus tax. My question is has anyone had any luck with plug and play pcm ordered online? A 10th of the price and I can repair the wiring myself. Any Canadian links? Thank you.