GT3037 T3 Flange Anti-surge Turbo Kit + Oil Return Feed Lines for 2.5-3L Engine January 4, 2024gt303725-3l, anti-surge, engine, feed, flange, gt3037, lines, return, turboadmin Very Good response turbo for 6 Cyl applications. This turbo has a flow capacity of about over 500HP. Exhaust Inlet (Turbo Manifold) Flange: Standard T3 Flange. Exhaust Outlet Flange: 4-Bolt Flange. Horse Power: Boost Horse Power up to 500BHP.