Vibrant 13177S 304 SS 4-Bolt Exhaust Flange for 4 in. Nominal Oval Tubing

Vehicle Fitment

• Universal - No vehicle-specific fitment. Compatible with any custom exhaust fabrication application using 4 in. nominal oval tubing requiring a 4-bolt flanged connection.

Fitment Notes

• This is a universal fabrication component. Confirm oval port dimensions (2.625 in. x 4.813 in.) match your existing tubing before installation.
• Matching graphite gasket available separately under part number 13177G.
• Can be purchased individually or in cost-effective boxes of 5.
• Professional welding is recommended for proper attachment to tubing.

Features

• T304 stainless steel construction resists heat, corrosion, and acidic exhaust gases
• 4-bolt configuration provides secure, even clamping force across the oval port
• 3/8 in. (10 mm) flange thickness delivers rigidity under high exhaust temperatures
• Oval port design matches factory-style oval tubing for seamless integration
• Weld-on design allows precise positioning during custom fabrication builds
• Compatible with Vibrant's full line of 4-bolt oval flange gaskets (13177G)
• Available in sizes ranging from 2 in. to 4 in. nominal oval across the product line
• Sold individually or in boxes of 5 for multi-connection or production builds

Specifications

• Part Number: 13177S
• Material: T304 Stainless Steel
• Bolt Pattern: 4-Bolt
• Nominal Oval Tube Size: 4 in.
• Oval Port Dimensions: 2.625 in. x 4.813 in.
• Flange Thickness: 3/8 in. (10 mm)
• Finish: Raw (Natural)
• Matching Gasket: Vibrant 13177G (sold separately)
• Warranty: 1 Year Limited Warranty

Included Components

• 1x Vibrant 13177S 4-Bolt Exhaust Flange, 4 in. Nominal Oval, T304 Stainless Steel

Product Description

The Vibrant 13177S is a T304 stainless steel 4-bolt exhaust flange designed for use with 4 in. nominal oval tubing in custom fabrication applications. At 3/8 in. thick, the flange provides solid clamping rigidity under sustained exhaust heat and pressure. The 4-bolt pattern distributes load evenly across the oval port opening, reducing the risk of warping or leak points that are common with 2-bolt designs on larger tube sizes.

This flange welds directly onto oval tubing and pairs with Vibrant's 13177G multi-layer graphite gasket (sold separately) for a leak-free sealed connection. Whether you're fabricating a custom cat-back, dual-exit system, or adapting factory oval sections to a flanged joint, the 13177S delivers the dimensional accuracy and material quality needed for a professional result. Available individually or in boxes of 5 for high-volume or repeat builds.