Stainless Works HCA2.52.5O2 Header Collector Adapter Inlet Outlet with Bung - 3-Bolt 2-1/2 2-1/2 O2

The Stainless Works HCA2.52.5O2 is a precision-built header collector adapter designed to connect a 2-1/2" 3-bolt header collector flange to a 2-1/2" OD exhaust tube. Constructed from 304 stainless steel and fully TIG welded, this adapter delivers a leak-free, corrosion-resistant connection built to handle the demands of high-performance exhaust applications.

Key Features:

• Constructed from 304 stainless steel for superior corrosion resistance and long-term durability
• Fully TIG welded for maximum strength and gas-tight integrity
• 2-1/2" 3-bolt collector flange inlet mates directly to standard 3-bolt header collectors
• 2-1/2" OD outlet for a straight-through, unrestricted exhaust connection
• Integrated O2 sensor bung welded into the tubing, positioned approximately 2" from the inside edge of the flange — ideal for wideband and narrowband oxygen sensor placement
• 3/8" thick laser-cut flange for a secure, warp-resistant seal
• Natural mill finish
• Designed and manufactured in the USA
• Sold individually — bolts, studs, and gaskets not included

Backed by Stainless Works' limited lifetime warranty, the HCA2.52.5O2 is an ideal solution for custom exhaust builds, header-to-exhaust connections, and performance applications requiring precise oxygen sensor placement close to the collector.