3.5in. Turn Down

The 3.5in. Turn Down by BEYEA CUSTOM HEADERS is a precision-engineered exhaust exit component designed for builders who demand clean, controlled exhaust flow routing on custom header systems. Whether you're fabricating a show-stopping engine bay or tuning a street machine, this turndown exit solves the critical challenge of directing hot exhaust gases away from underbody components while maintaining optimal scavenging efficiency. Built for applications where standard vertical or horizontal discharge doesn't suit your chassis layout or aesthetic vision, this component is essential for serious automotive fabricators and performance shops.

Fabricated from durable steel construction, the 3.5in. Turn Down features a 3.5-inch diameter bore engineered to match common header primary and collector sizing for seamless integration into custom exhaust systems. The turndown design angles exhaust exit toward the rear and downward, reducing underbody heat soak while preserving backpressure characteristics critical for engine breathing and torque delivery. At just 0.85 lbs, this component minimizes weight penalty while its compact profile (3.75 x 3.65 x 8.5 inches) allows installation in tight engine bay configurations where space limitations demand creative routing solutions. The precision fitment ensures consistent wall thickness and minimal turbulence, preserving the scavenging benefits you've already engineered into your header design.

This turndown exit works best for custom header projects, race vehicles, restorations, and street builds where off-the-shelf exhaust solutions don't fit your unique chassis geometry or performance requirements. Installation requires TIG welding to your existing 3.5-inch header collector or custom duct work—professional fabrication is recommended to ensure proper joint quality and long-term durability under thermal cycling and vibration. Ideal for hot rod builders, fabrication shops, and serious DIY enthusiasts with welding capability who prioritize form, function, and heat management in their exhaust design strategy.