I've got a 2010 with a v6 with a 5.7L swap. I still have testing to do but have consistent high voltage errors on both rear o2 sensors and can't get rid of them. I gave srt8 shorty headers with cats still installed. New o2 sensors, new coolant sensor, and a bunch of trouble shooting. I need to test the fuel pressure itself but was thinking of adding an adjustable fuel pressure regulator as an added preventative measure. Has anyone done this or have any input? Thanks in advance.