Ace Race Parts 27316 Transition Turbo Flange - Divided T4 to Dual 1-1/2 NPS (1.900 OD) - 304 StainlessAce Race Parts 27316 Transition Turbo Flange Divided T4 to Dual 1 1 2" NPS (1. 900" OD) 304 Stainless 304 STAINLESS BILLET TRANSITION TURBO FLANGE DIVIDED T4 TO DUAL 1 1 2" NPS (1. 900" ID) The Ace Race Parts brand of Transition Turbo Flanges is designed and precision CNC machined to offer the smoothest possible transition from a T4 divided housing to dual 1 1 2" nominal pipe size, or 1. 900" outside diameter pipe size material. Each flange is