PSR Unequal Length Exhaust Manifold/Headers with HEAT COATINGPSR all stainless steel exhaust manifolds are a tried and true solution for improving more power and torque through the entire RPM range of your Subaru. These single scroll Unequal length exhaust manifolds suit all EJ20 EJ25 single scroll turbo Subarus including Classic GC8 GF8, GDA GDB, GH GE GR GV and the final gen VAB STI. Lost wax finished flanges with a 4 1 collector and a smooth inner surface allows for better flow and reliability. Stable