Reference Manual

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Chapter 9: Exhaust: Diesel, Single-Outlet

Most G body diesel exhaust systems are a single-outlet exhaust system. Its components include the headpipe, which connects an intermediate pipe, or in the case of the 4.3L V6 a muffler, to the back of the passenger side exhaust manifold, the intermediate pipe, the muffler, and the tailpipe.

The G body diesel single outlet exhaust system uses a pair of cast iron manifolds bolted to the heads. Exhaust gases from the driver side manifold are directed by a crossover pipe to the passenger side manifold. An exhaust pipe bolted to the passenger side manifold directs the exhaust gases to the intermediate pipe, or in the case of the 4.3L V6 to a resonator mounted under the front passenger floorpan and then an intermediate pipe.

The intermediate pipe carries the exhaust gases under the propeller shaft over to the driver side where the intermediate pipe then travels up and over the rear axle to a muffler suspended laterally between the rear axle and the fuel tank. Exhaust gases enter the driver side of the muffler and exit from the passenger side of the muffler. A short tailpipe from the muffler carries the exhaust gases to behind the passenger side rear tire where the exhaust gases exit to the atmosphere.