Tomei Twin Scroll Expreme Exhaust Manifold - Subaru WRX / STI GDB / GRB / GVB Purchase Tomei Twin Scroll Expreme Exhaust Manifold - Subaru WRX / STI GDB / GRB / GVB Tomei Twin Scroll Expreme Exhaust Manifold - Subaru WRX / STI GDB / GRB / GVBWith many exhaust manifolds released so far, Tomei has always designed our headers with Performance, Reliability and quality aspects in mind. Now Tomei has a new model that is compatible with GDB, GRB and GVB. Introducing the highly acclaimed EJ twin scroll EXPREME header. With the very best of the TOMEI exhaust technology, this new design will deliver balanced optimised performance for power, torque and feeling.