2-Bolt Flange 3/8" Thick (You Choose Size) 0 2-Bolt Flange (You Choose Size) 2 1/4" Flanges: Steel flange designed for connecting to our header collectors. This is perfect if you are fabricating your own exhaust from the header back. 3/8" thick, for 2-1/4" exhaust tubing. 2 1/2"... $13.34 Quick view Add Wish List choose option