I know its been discussed over the years. Tuned N54s are known for cyl 5 "noise". Some say false knock, others say most N54s blow in cyl 5 (so actual knock). If it is false knock, does it hurt the motor to keep running it with cyl 5 dropping timing while all others look fine ? Ive also read this is more problematic in cars with IJEOS AT. Why is that ?