Ace Race Parts 3" 2-Bolt Exhaust Flanges are precision laser cut from 0.315" (8mm) thick CP2 Titanium plate in an ISO 9001 certified facility. After the cutting process is completed the flange is de-burred, inspected for the correct dimensions and flatness, and then cleaned. Each 2-Bolt Flange features slotted bolt holes to allow for minor adjustments in regard to positioning and installation.