All Hemi's have that keeps you from over reving for to long and doing damage (according to S.T.A.R.) mopar tech line. I asked back when I had a 03 Hemi truck.bigred76 said:Hello, I'm new to the forum and have a few questions. When I rev the car up in park or neutral it will only go up to 4000 rpms, why? Also I did flowmaster exhaust already and was wondering what you guys think I need to do next? Intake, Jet chip?