Mid-Pipe/Centre Section 
Exhaust Silencer
| Location | The exhaust mid-pipe or centre section is located centrally underneath the car and is directly connected to the manifold/cat (front) and silencer (rear). |
| 2021 Regulations Reference | 5.7.6 |
| Parts to Discard | – Mid-pipe/centre section (where required) – Rubber Mountings – Exhaust Clamps – Manifold to Mid-Pipe Sealing Ring – Fasteners |
| Important Checks | It is recommended to replace worn or damaged exhaust fasteners/mounts/gaskets in order to make the car safe and as reliable as possible. |
Requirements
The entire exhaust system must be removed for inspection, the centre section can be replaced where necessary and can be supplied by the City Car Cup or a reputable parts supplier, but must be a standard part as per the regulations set by the BRSCC.
The exhaust system must comply with Motorsport UK silencing regulations J 5.16, J 5.17 and J 5.18
Suggested Disassembly Method (4 Steps)
Step 1. First, ensure the car is at a workable height and secure and support the centre section of the exhaust system with a suitable device such as a transmission jack/lift before starting to remove any parts. Although the centre pipe section is supported by a rubber mount it is located quite a way towards the engine, without support the centre section could sag/fall when you remove the silencer putting you at risk, and also puts strain on the system. IMAGE REQUIRED
Safety Tip – Before starting work on the exhaust system (or at any point when working under the vehicle) ensure that it is cool and you are wearing suitable protective eyewear as debris often falls from the underside of the car when removing the exhaust system.
Support Centre Section Here (Before Removing Silencer)
Step 2. Disconnect the exhaust silencer from the mid-section or centre pipe by removing the clamp that connects it to the silencer. In many cases, the bolt/nut and clamp are badly corroded and often brakes upon removal, sometimes requiring cutting off.
1. Old Clamp 
2. Clamp Bolt (Newer Example) 
3. New Exhaust/Clamp Example (For better clarity)
Step 3. Finally, unhook the exhaust silencer by removing the rubber mountings on the left and right side and lower the silencer from under the car. Now unhook the exhaust silencer by removing the rubber mountings on the left and right side and lower the silencer from under the car.
1. Silencer Left Mount 
2. Silencer Right Mount 
3. Silencer Rubber Mounts 
4. New Rubber Mount Example
Step 4. With the mid-pipe/centre section supported you can disconnect the O2/Lambda Sensor by unplugging the sensor from the wiring loom or by removing it completely from the mid-pipe. Now disconnect the mid-pipe to manifold/cat connection bolts.
1. O2/Lambda Sensor Connection 
2. Disconnect O2/Lambda Sensor 
3. O2/Lambda Sensor Connection 
4. Mid-Pipe to Manifold Bolts
Step 5. The mid-pipe will now be supported by the transmission jack (or a suitable alternative) and the mid-pipe rubber mount which can now be removed to complete the removal.
Mid-Pipe Rubber Mount