Ace Race Parts 27024 2.375 (60mm) 3-Bolt Exhaust Flange 304 StainlessAce Race Parts 27024 2. 375" (60mm) 3 Bolt Exhaust Flange 304 Stainless The Ace Race Parts brand of 60mm ID heavy duty 3 Bolt Exhaust Flanges are machined from 1 2 inch thick 304 Stainless and will not warp when welded. Ace Race Parts Stainless Exhaust Flanges feature slotted style bolt holes for added adjustability and easy alignment. Unlike other brands, who only offer 3 8 inch thick flanges, Ace Race Parts heavy duty 1 2 inch thick exhaust flanges