Ace Race Parts 37103-1 T4 Turbo Inlet Flange Mild Steel (M10 x 1.5 Tapped Holes)Ace Race Parts 37103 1 T4 Turbo Inlet Flange Mild Steel (M10 x 1. 5 Tapped Holes) The Ace Race Parts brand of Turbo Inlet Flanges are precision machined from 1 2 inch thick 1018 Mild Steel and will not warp or deform. Ace Race Parts T4 Turbo Inlet Flange features M10 x 1. 5 threaded bolt holes and can handle the extremely high exhaust temperatures of a turbo manifold. FEATURES 0. 500" Thick, 1018 Mild Steel Will Not Warp or Deform! M10 x 1. 5 Threaded