The MGC stainless steel exhaust range is manufactured by Double S Exhausts to exacting standards in 309 and 401 grade stainless steel with mirror finish silencers, produced to accurate tolerances for straightforward DIY fitment. Every system carries the Double S lifetime guarantee, making a stainless system a worthwhile long-term investment over mild steel, which is susceptible to corrosion in typical British driving conditions, road salt, wet roads, and short journeys that allow condensation to collect in the silencers, and typically requires replacement every few years.
Lifetime Guarantee Quality
The two stainless grades are selected for their specific properties. 309 grade is chosen for its heat resistance where exhaust gas temperatures are at their highest, and 401 grade for its combination of strength and corrosion resistance through the remainder of the system. The mirror finish silencers maintain their appearance throughout the life of the system without polishing or treatment, and the precision-engineered tolerances mean the system fits accurately without modification. The lifetime guarantee reflects the corrosion-immune nature of stainless construction, once fitted, a Double S system effectively removes exhaust replacement from the car's ongoing maintenance schedule.
Complete System or Individual Sections
The stainless system is available as a complete system or as individual front pipe and rear pipe and silencer sections, allowing targeted replacement of a single component while retaining the rest of an existing stainless installation. The complete system is supplied as a matched set with precise joint alignment, suited to any car requiring full exhaust renewal. Individual sections suit owners who need to replace a specific failed component, typically the front pipe, which is exposed to the highest temperatures and greatest thermal cycling, while retaining the rest of a system in serviceable condition.
Comparison with Mild Steel
A mild steel exhaust system represents a lower initial outlay than stainless, but the recurring replacement cycle erodes this advantage over time. In typical British driving conditions, mild steel systems corrode from the inside out and reach end of service within a few years, with the rear silencer typically the first component to fail. A stainless steel system is immune to this corrosion process, maintaining structural integrity, gas-tight sealing, and appearance indefinitely. For any MGC kept for long-term ownership, stainless represents the more sensible option both in terms of long-term economy and the avoidance of repeated workshop time spent on exhaust replacement.
Sound and Performance
The stainless system produces a slightly different exhaust note from the mild steel equivalent, generally described as crisper and more defined, with a more characterful six-cylinder tone that suits the C-series engine's nature. The pipe diameters and silencer volumes are matched to the engine's exhaust gas flow requirements, ensuring no restriction of flow while maintaining civilised noise levels for regular road use. Owners replacing a tired original system typically notice both an improvement in note and a small but perceptible improvement in engine responsiveness, reflecting the cleaner gas path the new system provides.
MGC Y-Piece
A stainless MGC Y-piece is available separately for owners replacing this specific component, suited to the MGC's two-into-one exhaust layout from the cylinder head manifolds into the front section of the system.
The Double S Lifetime Guarantee, Backed by Four Decades of Partnership
MGOC Spares has worked in partnership with Double S Exhausts for over forty years. In that time, thousands upon thousands of Double S systems have been supplied to MG owners across the UK and around the world, every one of them backed by the Double S Lifetime Guarantee. It is, in honest truth, something of a novelty when called upon to honour it, the combination of premium British stainless steel, expert hand fabrication, and decades of refinement means Double S systems are built to outlast the cars they are fitted to. On the rare occasions when an issue does arise, it is treated with exactly the same care and seriousness as the day the exhaust was first supplied.
Most telling of all are the receipts that occasionally accompany those claims; rear silencers have been replaced on the strength of paperwork dating back decades, the most memorable recent example being one first supplied in 1991, honoured from a handwritten receipt kept in a glovebox for over thirty-five years. That says something important about both the product and the relationship behind it. Double S systems are built to last, and MGOC Spares stands behind every one supplied, not just on the day of purchase or the twelve months that follow, but for as long as that exhaust is on the car. Decades of service.
A guarantee with no expiry.