Exhaust System: Description and Operation

Exhaust System
the exhaust system on the MINI is constructed in two sections:
- the manifold and front pipe - manufactured as a single piece.
- the center/rear section - manufactured as a single piece that can include up to three silencers, dependent on the model.

the system is designed to meet current noise legislation producing just 74 DBA.

Exhaust Manifold and Front Pipe
the Manifold and front pipe is common to both models. the flange of the front pipe (cylinder head mounting) is manufactured from mild steel, while the four primary tracks are of stainless steel. they all join a load supporting decouple. From the decouple the exhaust continues in a single pipe to the metallic starter catalyst and the ceramic catalyst. the outer casing of the catalyst is manufactured from stainless steel. From the catalyst a short section of pipe meets the mounting flange that is joined to the center pipe by a two point mounting.

To meet emission legislation an additional oxygen sensor is fitted downstream of the catalyst.

Center Pipe and Rear Silencer.
All tailpipe silencers have an Aluminized mild steel outer casing. the rubber support hangers are silicone based.

the MINI COOPER has a silencer located at the front of the center pipe, which has a volume of 1.8 liters. the rear silencer is finished with a polished stainless steel tailpipe trim, known as the "Coke" can design.

MINI COOPER S
the MINI COOPER S also has a center silencer but its size has been increased to 3 liters. the rear section of the exhaust consists of two silencers, one mounted on each side of the vehicle. the rear silencers are mounted by two sets of silicone based hangers. Two pipes leave the left hand silencer and exit the body in the center of the vehicle. the tail pipes are finished with polished stainless steel trim.