Exhaust Back Box Fitting & Repair
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£148.08
Average quote for exhaust back box repairs
A back box is a common type of silencer connected to one or more tailpipes and situated between the catalytic converter and the rear axle. Its purpose is to limit or change the sound produced by the gases passing through the exhaust system; it also slows them down. In theory, slowing down exhaust gases can improve the engine's performance, though it is unlikely to have a noticeable effect. Although many back boxes are designed for quietness, the size and shape of the part can vary to produce different sounds. Owners of high-performance cars may want their vehicles to sound louder and more powerful; a back box can help with this.
Exhaust fitting
The average price of an exhaust fitting on FixMyCar is £135.25. If you’re experiencing signs of a faulty exhaust, and think it’s time to get a new one fitted, a professional will source the right parts and fit the new components for you.
Can include- Parts sourcing
- Exhaust fitting
Car exhaust repair
The average cost of an exhaust repair booked on FixMyCar is £112.67. Exhaust repairs can range from sealing holes and tightening fittings to replacing parts with extensive damage. You may need an exhaust repair if you notice an unusual noise coming from the exhaust.
Can include- Diagnosis
- Exhaust hole repair
- Exhaust silencer repair
- Exhaust replacement
Symptoms of a faulty back box
Back boxes can fail due to normal wear and tear, which will happen more quickly if the part is of low quality. Signs of a faulty back box include visible cracks, loud noises from the exhaust system that are more noticeable when accelerating, and rust.
Unfortunately, rust is one of the most common causes of exhaust failure. In its early stages, it can be treated to prevent further corrosion, but it often leads to parts having to be replaced.
Learn more about exhausts
When should I replace my back box?
If you keep the exhaust system in good condition, the back box should last at least 45,000 miles. However, primarily using your car for short journeys around town will prevent the back box from getting hot, leading to condensation - a common cause of corrosion - which decreases the part’s lifespan.
Can you drive without an exhaust back box?
Unlike some car parts - the catalytic converter, for instance - having a back box is not a legal requirement because it doesn’t affect the exhaust's functionality. Its sole purpose is to alter the exhaust system's noise.
What is the difference between a back box and a silencer?
A silencer is an exhaust part designed to reduce noise. Many back boxes are silencers, but some are designed to change or amplify the exhaust's noise rather than make it quieter.
