Tomei - Full Cast Exhaust Manifold (Twin Setup) Turbo Manifold - Nissan - Skyline GT-R BNR32Specifications: Manufacturer: Tomei Reference Number: 415003 Exhaust Type: Turbo Manifold Material Used: Cast Iron All new, non welding one piece structure made by full lost wax casting ensures incredibly higher durability comparing to the old type which was weld assembled structure made from pieces individually casted. Although lost wax casting in one piece structure makes the process much more difficult and time consuming, the biggest benefit is