Shorty Headers for Toyota Tundra (2004-2014) 5.7LHigh Flow Shorty Headers for 2004 2014 Toyota Tundra Direct bolt on shorty headers replace the restrictive factory cast iron exhaust manifolds to improve scavenging, reduce cylinder temperatures, and increase low to midrange torque while retaining factory catalytic converters. The Stock Tundra Exhaust Restriction The OEM Toyota cast iron exhaust manifolds on the 3UR FE are notoriously inefficient and prone to long term failure under heavy loads.