I used the the 545rfe with my 2004 5.7. Installed in 2011 and have put over 60,000 miles on them. ( had 27,000 when purchased them, so 87,000 total). I’ve driven this car across the country from east coast to west coast. I never did any performance upgrades. I won’t make money racing it. Way too much fun to drive. I can cruise down the highway at 90mph usually 80mph. It’s bone stock 04. I’ve run it at the track for fun. Auto cross race it once a month.
Oh yeh I have the Hotwire harness. My son was 13 and he installed the harness when he got home from school. It’s truly plug m play.
