The exhaust manifold for gasoline engines is mounted on the cylinder head. For diesel engines, the exhaust manifold is mounted on the turbocharger. A muffler intake pipe is attached to the exhaust manifold, which has its own characteristics inherent in the corresponding type of engine. The 66 kW four-cylinder petrol engine and both diesel engines have a single exhaust pipe. For a four-cylinder engine with a power of 85 kW, as well as for a five-cylinder engine, the exhaust pipe is double, and then goes into a single one. The exhaust pipe of six-cylinder engines has a completely different design. Each row of cylinders has its own exhaust pipe with a catalyst.
All engines are equipped with a catalytic converter, from which there is a small pipe connecting the exhaust pipe and the catalytic converter to the main muffler. On six-cylinder engines, two short connecting pipes lead to the main muffler: one from each intake.
The final link in the exhaust system is the main silencer and the secondary silencer with an exhaust pipe, with the main silencer having a special design for five- and six-cylinder engines. The main muffler of these engines consists of two parts located to the left and right of the longitudinal axis of the exhaust system. The exhaust pipe of six-cylinder engines is dual.
With regard to the design of the exhaust system of quattro models, the front-wheel drive and quattro models are identical in terms of the exhaust pipe and catalytic converter. The differences start behind the catalyst. For six-cylinder engines, the transition from both exhaust pipes to one is made using a V-shaped adapter. On all quattro models, the main silencer and the secondary silencer have a short connecting pipe. The secondary and main mufflers can be changed separately. Unlike the main mufflers of front-wheel drive vehicles, which are made of two twin half-shells, the main muffler of the quattro models is a single-shell. The exhaust pipe on the additional muffler of quattro vehicles is twin. The dual exhaust pipe of the additional muffler is also available for vehicles with a diesel engine (see illustrations 1.0 and 1.0a).
1.0 System of release of the fulfilled gases. Gasoline engines
66 kW four-cylinder engine
1 - exhaust pipe mufflers
2 - catalyst
3 - main muffler
4 - additional muffler
85 kW four-cylinder engine
5 - exhaust pipe mufflers
6 - catalyst
3 - main muffler
4 - additional muffler
133 kW five-cylinder engine
7 - exhaust pipe mufflers
8 - catalyst
9 - main muffler
10 - additional muffler
110/128 kW six-cylinder engines
11 - intake pipes of mufflers with catalysts
12 - main muffler
13 - additional muffler
1.0a Exhaust system. Diesel engines
1 - bracket for fastening the exhaust pipe to the engine
2 - mounting bracket for the main muffler
3 - bracket for mounting the front pipe of the additional muffler
4 - bracket for mounting an additional muffler
5 - intake pipe mufflers
6 - catalyst
7 - clamp for fastening the junction of the exhaust pipe and the main muffler
8 - main muffler
9 - tightening brackets
10 - additional muffler
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