Long Tube Headers For Ford Mustang GT (1996-2004) with 4.6L 2-valve EngineTurn your restrictive 2 Valve Modular V8 into the fire breathing muscle car it was meant to be. Performance Long Tube Headers for Ford Mustang GT (SN95 4. 6L 2V) The 4. 6L Modular engine is a tank, but in stock form, it tries to exhale through a straw. Ford equipped the 1996 2004 GTs with cast iron "log" manifolds that strangle high RPM airflow and mute the exhaust note. These long tube headers solve the biggest restriction in your exhaust system by