Rt automatic 0-60 times
 

I have a 09 challenger rt automatic, and I put on a mopar catback exhaust and mopar cold air intake. The 0-60 times are all over the board. I have a best time of 4.73 and a worst time of 5.5. I have ran about 30 times using the timer and I have hit under 5 seconds 6 times. I get mostly 5.1 to 5.2. Does anyone have these mods and are you having 0-60 times all over the board as well?