Two problems related to manifold/header/muffler/tail pipe have been reported for the 2007 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Chevrolet Silverado 1500 based on all problems reported for the 2007 Silverado 1500.
The manifold bolts have broken off into the head of the engine. Resulting in failure of seal to head from the exhaust manifold. In turn, has caused the catalytic converter to fail and now the vehicle requires extensive work to pass emissions testing in California. It only takes one bolt to break on the exhaust manifold to cause this issue. The bolts are obviously the weak link. The engineering design needs to be modified immediately. It is not listed as a maintenance item in any gm owners manual. Why should the consumer be responsible for an item that causes catastrophic failure to the emission system, which is a mandated and governed by the federal government and fee'd accordingly via state and county guidelines.
Exhaust vibrates at 1200 rpm to 1400 rpm. The whole truck moans and vibrates. I would think the vibration in time will cause premature failure in exhaust system.