Armstrong Siddeley 12 Plus/14hp Exhaust System

Model years from: 01/01/1936

Model years to: 12/31/1939

Preserve the grace and driving joy of your Armstrong Siddeley 12 plus/14hp with our expertly built stainless steel exhaust , engineered for enthusiasts, by enthusiasts.

Crafted using advanced shaping techniques and finished by hand, this exhaust system is a precise match for the Armstrong Siddeley 12 plus/14hp. It enriches both tone and responsiveness while staying true to the car’s factory form.

You’ll enjoy a deeper, more characterful exhaust tone and livelier throttle feedback, all while preserving the spirit of your Armstrong Siddeley 12 plus/14hp.

Every Armstrong Siddeley 12 plus/14hp carries a sense of occasion , a reminder of an era when driving was more than transport; it was style, statement, and engineering pride. This system adds depth to that experience without overshadowing its originality.

Beyond its visual appeal, this upgrade represents a commitment to preservation , it’s about keeping your Armstrong Siddeley 12 plus/14hp not just running, but thriving in today’s world of modern roads and expectations.

The acoustics of this system are carefully engineered: subtle at idle, characterful under load. It delivers aural satisfaction that’s authentic, not overwhelming , matching the tone and temperament of your classic Armstrong Siddeley 12 plus/14hp.

Disclaimer: All imagery represents our design and build quality. It may not depict the exact exhaust system for your Armstrong Siddeley 12 plus/14hp. Please enquire for details.

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Product & Manufacturing Details
• Handmade in Great Britain – All classic car exhaust systems and manifolds are crafted to order in our UK workshop.
• Premium 304 Stainless Steel – Each performance exhaust system is built from exceptional-quality 304 grade stainless steel, chosen for its strength, corrosion resistance, and long-term durability. Where required, mild steel flanges are used for precise vehicle-specific fitment.
• Built to Order – These bespoke exhaust systems are not held in stock. Please allow up to four weeks for manufacturing, plus delivery time. We will keep you informed throughout the build process and provide detailed shipping updates.

Warranty & Guarantee
• Two-Year Manufacturer’s Guarantee – Covers workmanship and manufacturing defects.
• Lifetime Corrosion Warranty – Protects against perforation caused by corrosion, provided the system remains unmodified from the manufacturer’s specifications.
• Defects Process – Any suspected defect will be assessed by the manufacturer, who will determine whether repair or replacement is appropriate under warranty.
• Non-Refundable Policy – Custom-made and bespoke exhaust systems are non-refundable once fitted, except where covered by the above guarantees.

Returns & Refunds
• Items ordered or shipped in error by us will be refunded or replaced with the correct parts.
• Parts ordered in error by the customer are not refundable.
• Stock items returned are subject to a return shipping fee and a re-stocking fee (currently 15%).
• Damaged deliveries must be signed for as damaged or refused and reported to us immediately.
• Parts with a manufacturing defect will be covered under the manufacturer’s warranty; bespoke and custom-built exhaust systems are not eligible for refunds.

Mail-Order & Specially Ordered Items
• Specially ordered or custom-built exhaust systems must be paid in full before manufacturing begins.
• Mail-order exhaust parts and accessories must be paid in full before despatch.

Onsite Works & Project Vehicles: Fitment and Installation
• You may retain original vehicle parts removed during fitting. This must be agreed and documented on the Workshop Job Card.
• Retained parts must be collected within 7 business days; otherwise, they will be disposed of without further notice.

Armstrong Siddeley 12 plus/14hp Exhaust System

Additional information