I have a 2015 Challenger RT and about 3k on it. I hear some lifter tapping going on, is that normal? Ive been told that all 5.7L Hemi's do that. Still not a sound that Im comfortable with. Any ideas how to stop the tapping? I changed the oil at 800 miles to 5w20 Mobil1 extended performance and Fram 15k Ultra synthetic filter. I do race the car but don't hit rev limiter like armatures. It is a 6-spd stick. No mods...yet. before I get into it I would like to know if this is a problem to have fixed first, and is it a warranty liable issue? Any advice would be great. Thanks.