Does the knock have a certain rythem? Does the rythem increase or decrease in respect with engine RPM?
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03 2500 SLT, HTS Billet Trans, Airdog 150, II CP3, +75HP Injectors, K&N CAI, 4" 409SS EXHT, Bully Dog TD, Flex-a-lite fans, 20x10 WCC dubs, 35s Nitto Trail Grapplers, Road Armor, 2' leveled.