Magna flow doesn't make a downpipe. Being unturned for a downpipe on a 32 bit ecu is the best way to ruin that block quick. You cannot tune for a bov, so they're blowing smoke up your ass. Cam seals have negative 1000% to do with compression. I wouldn't trust that car to drive across the city, let alone across a state or country. That low compression cylinder is out of safe limits, and continuing to drive it like this means more damage.
You got taken. You didn't get any inspection, you bought a nodded car with problems, and now you need serious work done. The dealer doesn't care if you make it more then 10ft off the lot. You signed for the car AS IS. Being navy I expected nothing more. Maybe you'll learn now.