20R/22R/RE Header Flange (You Choose Style) 0 Header Flange (You Choose Style) Steel header flange for custom fabrication of exhaust header on 20R, 22R, or 22RE engines. 1/2" thick flange with 1-1/2" or 1 5/8" ports. This header flange is the... $65.51 Quick view Add Wish List choose option