Noise Underload: Pinging or Exhaust leak?????

[babeabe19]

Im having a tough time figuring this one out. When im at WOT on the freeway i get this random pop between 4k and 6k rpm. its kinda fiant but its noticeable. i pulled 4 of my plugs(2 from each side), and found that they were in perfect condition. im using 91 octane from 76, my Predator tuner set at 20% increase in timing, and ive got 106k on the motor. any thoughts???

 

[nwapache]

when you say a random pop what do you mean? Pinging/detonation is more of a gurgling noise or a coffee can full of marbles being shaken....
Is it a single popping noise? or repeating? fast or slow?

 

[fastangboi]

what do you mean by "side cut autolite plugs?"

 

[fastangboi]

any body ever heard of side cut plugs?