Bosal 135-601 End Silencer

Bosal 135-601 End Silencer

The Bosal 135-601 End Silencer is a high‑performance exhaust component engineered for optimal sound attenuation and emission control in a wide range of front‑engine, rear‑wheel drive vehicles. Designed with precision machining and advanced materials, this silencer delivers reliable noise reduction while maintaining engine efficiency.

Design & Construction

Robust Cast Iron Body

The core of the 135-601 is a cast iron shell, chosen for its excellent thermal conductivity and resistance to high exhaust temperatures. This material ensures long‑term durability, even under aggressive driving conditions.

Internal Baffle System

Inside the silencer, a series of strategically placed baffles disrupts exhaust flow, converting kinetic energy into heat and reducing sound pressure levels. The baffle geometry is optimized to target mid‑range frequencies typical of passenger cars.

Heat‑Resistant Lining

A layer of high‑temperature ceramic lining protects the cast iron shell from oxidation and corrosion, extending service life and preserving performance.

Sealed End Flange

The end flange is engineered with a tight seal, preventing exhaust leaks that could compromise sound attenuation or increase emissions. The flange design also facilitates easy mounting to the vehicle’s exhaust manifold.

Performance Benefits

Superior Noise Reduction

By converting turbulent exhaust gases into heat, the 135-601 reduces audible noise by up to 30 decibels compared to stock silencers in many applications. This results in a quieter cabin and improved driving experience.

Emission Control Compliance

The silencer’s design helps vehicles meet stringent emission standards, such as Euro 4/5, by minimizing unburnt hydrocarbons and reducing overall exhaust output.

Maintained Engine Efficiency

Unlike some aftermarket silencers that create excessive backpressure, the 135-601’s internal geometry is calibrated to preserve engine breathing. This balance ensures that power delivery remains unaffected while noise levels drop.

Compatibility Overview

The Bosal 135-601 End Silencer is specifically engineered for a range of front‑engine, rear‑wheel drive models from major European manufacturers. Key compatible vehicles include:

• CITROËN C3 (I & Pluriel) – various engine sizes and configurations.
• PEUGEOT 1007 – 1.6L 16V engines with 80–110 CV output.
• Other front‑engine, rear‑wheel drive cars sharing the same exhaust manifold geometry.

For each model, the silencer matches the stock mounting points and flange dimensions, ensuring a bolt‑on fitment without the need for custom adapters.

Installation Guide

Tools Required

• Socket set (10 mm to 13 mm).
• Torque wrench.
• Jack and jack stands.
• Safety gloves and eye protection.

Step‑by‑Step Procedure

1. Secure the Vehicle: Raise the rear of the car using a jack, then place it on sturdy jack stands. Ensure the vehicle is stable before proceeding.
2. Remove Existing Silencer: Locate the rear exhaust manifold flange. Using the appropriate socket, loosen and remove the bolts securing the stock silencer. Carefully detach the silencer, noting any gasket or sealant remnants.
3. Prepare the New Silencer: Inspect the 135-601 for any manufacturing marks or damage. Clean the mounting surface on both the silencer flange and the vehicle’s exhaust manifold to ensure a proper seal.
4. Mount the Silencer: Align the new silencer with the exhaust manifold flange. Hand‑tighten the bolts first, then use a torque wrench to achieve the manufacturer’s specified torque (typically 80–100 Nm). Ensure all bolts are evenly tightened.
5. Check for Leaks: Lower the vehicle slightly and start the engine. Observe the silencer area for any exhaust leaks or abnormal noises. If necessary, re‑tighten bolts or replace gaskets.

Post‑Installation Checks

• Verify that the silencer is securely mounted and free from vibration.
• Confirm that the exhaust pipe remains straight and unobstructed.
• Perform a short drive to ensure normal engine performance and sound levels.

Maintenance & Care Tips

• Regular Inspection: Check the silencer every 10,000 km for signs of corrosion or damage. Replace any damaged components promptly.
• Avoid Excessive Heat Exposure: While cast iron is heat‑resistant, prolonged exposure to extreme temperatures can degrade seals. Keep the vehicle’s engine bay clean and free from oil spills.
• Use Quality Gaskets: When reinstalling or replacing bolts, use fresh high‑temperature gaskets to maintain a leak‑free seal.

Frequently Asked Questions

Q: Does the 135-601 affect engine performance?

A: No. The silencer’s internal design preserves exhaust flow, ensuring that horsepower and torque remain unchanged while reducing noise.

Q: Can I install this silencer on a vehicle with a different exhaust layout?

A: The 135-601 is specifically tailored for the front‑engine, rear‑wheel drive architecture of certain Citroën and Peugeot models. Installing it on incompatible vehicles may require custom adapters or could compromise performance.

Q: Is the silencer compatible with aftermarket exhaust systems?

A: The 135-601 is designed to fit stock exhaust manifolds. If you have a full aftermarket system, verify flange compatibility before installation.

Conclusion

The Bosal 135-601 End Silencer exemplifies engineering excellence in exhaust noise control. With its durable cast iron construction, precision baffle design, and seamless fitment for popular Citroën and Peugeot models, it delivers a quieter cabin without sacrificing performance or emissions compliance. Whether you’re restoring a classic vehicle or upgrading an existing one, this silencer offers reliable, long‑term sound attenuation that meets the demands of modern driving.