Upgrade for Header exhaust system with the  21142 header reducer. with o2 sensor BUNG
GASKET and BOLTS INCLUDED
Universal flange type fitment

This high-quality product is manufactured from mild steel material and includes a gasket or seal for easy installation. The 3-bolt gasket-style flange ensures a tight seal and comes with all the necessary hardware included.
This is for 1 USA HEDMAN HEDDER UNIVERSAL FITMENT PRODUCT designed for aftermarket o2 sensor fuel control