Our Turbo Outlet Pipe features 2.25" diameter aluminum tube for optimized flow. The CNC machined billet mating flange makes connecting this TOP to your FMIC literally a snap. The billet anodized turbo to TOP connector, 2.25" coupler and premium clamps top this package off. If you're looking for a simple bolt on modification that will optimize flow and increase power, then this part is for you.