yo everyone, so i have cats, catback exhaust and the stillen intake n z tube for my g35c 6mt and have had engine pinging 4ever. i got some ground wires and it seemed to help a little but still pinged. n e ways i got some adhesive reflective heat tape and wrapped my maf sensor pipe and z tube completely and there is no more pinging even after i drive it hard in 100 degree weather with the ac on and then floor it at low rpm. woot... hope u guys can benefit from this.