Stainless Works BBC Round Port 304SS Exhaust Flanges 2-3/8in Primaries (Raised Port Heads Only) - HFBBCH238RSD fits_1999-2005`Audi`Allroad 1 change in air/fuel ratio

1 change in air/fuel ratio and provide enough time to shut down an engine before damage occurs

Connects to OEM downpipes

Excellent Modulation And Release Characteristics

For Independent Rear Suspension (IRS) only

Stainless Works BBC Round Port 304SS Exhaust Flanges 2-3/8in Primaries (Raised Port Heads Only) - HFBBCH238RSD fits_1999-2005`Audi`Allroad 1 change in air/fuel ratioBig Block Chevy round port header exhaust flanges. These flanges come as a pair and are designed for 2 3 8" primaries, also these are used only for raised port BBC heads, laser cut from heavy duty 3 8" thick 304 stainless steel for superior resistance to warping from high heat, and comes with a limited lifetime warranty.