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de Graaf Exhausts

De Graaf Exhausts is a South African company that specializes in the design, manufacturing, and fitting of custom performance exhaust systems for a variety of vehicles. They offer a wide range of high-quality exhaust products, including catalytic converters, free flow systems, and custom stainless steel systems. De Graaf Exhausts prides themselves on using only the best materials, advanced technology, and a team of skilled craftsmen to produce top-of-the-line products that are both durable and effective.

De Graaf Exhaust: Enhance your vehicles performance

Why change a perfectly good working standard exhaust system? All vehicle manufacturers are subject to rules and regulations and are limited to exhaust gas regulations, which they must adhere to. The noise and emissions must be below a certain level. They control this by adding catalytic converters and diesel particle filters for emissions control and multiple baffled silencers for noise control. By adding these components to an exhaust system, you negatively influence the exhaust gas flow and hamper the vehicle’s performance.

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The Key Features of De Graaf Exhaust

Why Grade 441 Stainless Steel?

Grade 441 Stainless Steel exhibits remarkably high temperature strength, exceeding that of grade 409. It also has good corrosion and oxidation resistance in an exhaust gas environment. Grade 441 Stainless Steel offers high creep resistance, making the exhaust system less prone to cracks and ensuring a good fitment position at high and low temperatures. Additionally, 441 exhaust systems can be polished to a high sheen and maintain their appearance with regular cleaning.

Why Not Grade 304 Stainless Steel?

Grade 304 Stainless Steel is best used in the food and catering industry where it is not exposed to high temperatures. Due to its hardness in comparison to 441, it does not perform well in the exhaust environment. High heat and vibration can cause the 304 stainless steel to crack and break next to the welding.


Benefits of De Graaf Exhaust

De Graaf utilizes unique free-flow silencer designs and mandrel bend pipework to enhance exhaust gas flow. The enhanced flow improves performance and fuel efficiency. The free-flow silencer design dampens noise through absorption, achieving a decent noise level that maintains the desired vehicle sound. The mandrel bend pipework has minimal narrowing in the bends, allowing for 30% better flow of exhaust gas. These features contribute to an excellent exhaust system that enhances your vehicle’s responsiveness and ensures lower exhaust gas temperatures (EGTs) on your manifold and turbo, leading to better longevity.

De Graaf Specials Department:

The De Graaf Specials Department specializes in fabricating non-standard aftermarket items for the industrial, truck, and bus industry. They offer a variety of regular and special silencers and accessories, such as generator silencers, bus silencers, truck silencers, boat silencers, bike silencers, lawnmower silencers, and more. These products are tailored to affect the machine/engine sound and performance.

DeGraaf Pipe Works Fabrication:

De Graaf Pipe Works Fabrication offers bending work and fabrication services, including the manufacturing of exhaust pipes, boost pipes, stack pipes, furniture frames, cattle rails, rollbars, and more. They have CNC mandrel bending machines that can bend tubes with the finest tolerance, ensuring optimal gas flow and aesthetics.

De Graaf Custom/Motorsport:

De Graaf Custom/Motorsport specializes in manufacturing exhaust systems for the motorsport market. They provide high-performance exhaust parts and accessories, including custom branches/headers, ceramic coating for heat insulation, performance silencers in mild steel and stainless steel, and more. Their products are known for their excellent gas flow, sound, durability, and superior workmanship.

De Graaf exhaust systems feature free-flow silencer designs that effectively dampen noise through absorption. They are engineered to achieve a decent noise level that maintains the desired sound of your vehicle. Therefore, while the exhaust system may enhance the engine's sound, it will not create excessive noise.

Yes, De Graaf offers different noise levels in their ready-fit performance range for selected vehicles. You can choose between standard, mild, and wild options. Make sure to discuss your preference with your client and communicate it to the De Graaf Sales Team when placing your order.

Grade 441 Stainless Steel is chosen for its exceptional high-temperature strength, exceeding that of grade 409. It also offers good corrosion and oxidation resistance in an exhaust gas environment. Additionally, 441 Stainless Steel exhibits high creep resistance, making it less prone to cracks and ensuring a secure fitment position at both high and low temperatures. Moreover, it can be polished to a high sheen, maintaining its appearance with proper cleaning.

Grade 304 Stainless Steel is better suited for the food and catering industry, where it is not exposed to high temperatures. Compared to Grade 441, the hardness of Grade 304 Stainless Steel makes it less suitable for the demanding exhaust environment. Under high heat and vibration, it is prone to cracking and breaking next to the welding.