I have checked the exhaust and both sides appear to be clear. Right now the exhaust is pretty simple: 2 1/2” down pipes under the cab to cherry bombs then angled pipes exit in front of the rear tires. I’ll get a proper exhaust after I solve the backfire issue.

The truck has about 50 miles on it. I did the cam break in with no problem and started driving it around close to home. It ran fine until recently.