I bought a 2011 for my son it had a tick. I bought a 6.4 SRT cam and the new upgraded lifters. Used the Mopar performance springs and new pushrods. I found the valve tips worn really bad and digging into it I found the rocker has worn the shafts and actually wore the oil holes closed on the shaft. I had all the valves replaced and bought all new rockers. Noise is gone and it ran perfect with no tune. I did have it tuned it made 388 at the rear tires with just the cam swap. if your going to do it buy the srt cam its way cheaper then aftermarket and they run better. My buddy tunes these all the time and the mid range is great with the srt cam vs the aftermarket where you give up power down low and in the middle.