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Cat testing Duramax
Ok thank for the help. Is there a sepct for back pressure on cats. I can drill a hole and use the back pressure tester like on gas but dont know the spec for it. Or is there a better way to test them. I was thinking of heat gun like the old days. These trucks... Login to read more. 
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| Engine | 6.6 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 Chevrolet Silverado 2500 HD 6.6L
| Engine | 6.6 L |
| Trans | 4-speed Automatic (Electronic) |
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