Vibrant 13171 304 SS 3.5 in. Oval to 3.5 in. Round Transition Adapter 6 in.

Vehicle Fitment

• Universal - No vehicle-specific fitment. Suitable for any custom exhaust, downpipe, header, or intercooler piping fabrication requiring a 3.5 in. oval-to-round transition.

Fitment Notes

• This is a universal fabrication component. Installer must verify oval profile dimensions match existing tubing before installation.
• Nominal oval inlet size: 3.5 in. Confirm compatibility with mating oval tubing prior to welding.
• Professional TIG or MIG welding is recommended for a proper, leak-free seal.

Features

• T304 stainless steel construction withstands high heat, corrosion, and acidic exhaust gases
• Eccentric oval-to-round profile delivers a smooth, flow-efficient shape transition
• 16-gauge (0.065 in.) wall thickness provides structural rigidity without added weight
• Raw finish is weld-ready for MIG, TIG, or stainless filler wire applications
• 6 in. transition length minimizes turbulence across the profile change
• Non-magnetic alloy with high chromium and nickel content for long-term durability
• Compatible with Vibrant mandrel bend tubing, reducers, clamps, and V-band flanges
• Ideal for exhaust systems, custom headers, downpipes, and induction piping builds

Specifications

• Part Number: 13171
• Material: T304 Stainless Steel
• Inlet: 3.5 in. Nominal Oval
• Outlet: 3.5 in. O.D. Round
• Overall Length: 6 in.
• Wall Thickness: 0.065 in. (1.65 mm) - 16 Gauge
• Finish: Raw (Natural)
• Warranty: Five Year Limited Warranty

Included Components

• 1x Vibrant 13171 Oval to Round Transition Adapter, 3.5 in., T304 Stainless Steel, 6 in. Long

Product Description

The Vibrant 13171 is a T304 stainless steel transition adapter that converts a 3.5 in. nominal oval tube section into a 3.5 in. round O.D. outlet over a 6 in. eccentric profile. The gradual shape change maintains consistent flow velocity and reduces turbulence through the transition, making it well-suited for performance exhaust builds, custom downpipes, and headers where oval factory sections need to connect with round aftermarket tubing.

Built to 16-gauge wall thickness with a raw stainless finish, the 13171 is straightforward to weld into place and pairs cleanly with Vibrant's full lineup of mandrel bends, reducers, clamps, and couplers. Always verify the oval inlet profile against your existing tubing before installation to ensure a flush, gap-free fit for welding. Backed by Vibrant's five-year limited warranty.