Exhaust System: Description and Operation

Exhaust System

Vehicles with 2.5L or 3.0L engine

Exhaust System:

All petrol vehicles are fitted with a stainless steel exhaust system consisting of:
- catalytic converter(s)
- front pipe
- muffler inlet pipe
- front muffler assembly
- muffler and tailpipe assembly

The exhaust system is designed to meet the rising standards of vehicle emissions, complying with LEV (USA) and stage three (Europe) emission legislation; effective from January 2001.

The exhaust system is supported at the front by the two catalytic converters which are retained directly to the exhaust manifolds by studs and nuts. The remainder of the exhaust system is supported by four rubber hanger isolators. On 2.0L and diesel vehicles there are three attached to the front muffler assembly and one attached to the rear muffler. On 2.5L and 3.0L vehicles there is one attached to the front muffler and three attached to the rear muffler and tail pipe assembly.

A flexible coupling, which is part of the front muffler, is fitted to isolate the exhaust system from engine movement and vibration.

For 2.5L and 3.0L vehicles the rear exhaust muffler and tail pipe assembly is manufactured in one section which consists of a 'Y' pipe joined to the two rear muffler and tail pipes. A service fix is provided for replacement of the rear mufflers and tail pipes. For 2.0L and diesel vehicles there is a single rear muffler assembly which is attached to the left-hand side of the vehicle.

Three Way Catalytic Converters

The catalytic converters each contain two bricks coated with palladium/rhodium. These elements are utilized to control the emissions of hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx) from the engine.

Oxidation Catalytic Converter

The catalytic converter contains a brick coated with platinum. This element is utilized to control the emissions of hydrocarbons (HC), carbon monoxide (CO) and particles of matter from the engine.