DU-BRO Exhaust Extensions – Custom & Direct-Fit RC Muffler Extensions

The DU-BRO Exhaust Extensions make it easy to direct engine exhaust exactly where you want it, keeping your RC airplane cleaner and helping protect your fuselage from oil spray. Whether you need a custom-made extension or a direct-fit solution for popular .40–.46 engines, DU-BRO gives you reliable, high-quality options that are simple to install and built to last.

#213 – Custom Aluminum Exhaust Extension

This version is ideal for pilots who want a completely flexible solution. The aluminum stock is 6 inches long and can be cut, drilled, tapped, or welded to match your exact muffler setup. It fits most .29–.80 2-stroke engines and allows you to build the perfect extension for unique or tight-fitting installations. This is a great choice for custom airframes, scale models, and aircraft where precise exhaust routing matters.

• Length: 6"

• Weight: 96 grams

• Fully customizable aluminum

• Works with most .29–.80 2-stroke engines

#699 – Direct-Fit Muffler Extension

Designed for convenience, this extension fits many popular .40–.46 engines, including ASP, Magnum, O.S., and Thunder Tiger. It includes (2) 3mm x 50mm mounting screws and lines up perfectly with standard muffler bolt spacing (1 7/16" / 36.51 mm). This makes installation fast, clean, and frustration-free.

• Includes screws

• Bolt spacing: 1 7/16"

• Weight: 13 grams

• Perfect for .40–.46 engines

Both exhaust extensions are Made in the USA and built with durability and practical use in mind. Whether you’re customizing a unique setup or need a quick bolt-on solution, DU-BRO Exhaust Extensions help keep your model cleaner and running smoothly.