Ferrea 6000 Series Exhaust Valve - Honda K20A2/3, K20Z1, K20Z3, K24A2 +1mm Oversize - Set of 8 - F6072 38mm Lug Seat Diameter : 22mm

Lug Seat Diameter : 22mm (Largest portion of the lug seat)

Compatible with all currently known B-Series transfer drive & hypoid gear sets

and includes  an O-ring

but the factory shrouding beneath the front grille can stay to keep constant airflow directed at the core

Whether you are entering your 2015-2016 WRX in the local rallycross or lapping at your next track day

Ferrea 6000 Series Exhaust Valve - Honda K20A2/3, K20Z1, K20Z3, K24A2 +1mm Oversize - Set of 8 - F6072 38mm Lug Seat Diameter : 22mmThe 6000 Series Competition Valves are designed to provide excellent reliability in an environment of high spring pressures and roller cams, at a budget price. They have higher fatigue resistance and tensile strengths than our competitors best offerings. To manufacture the valves we use our exclusive two step slow forging process using EV8 stainless steel on both intake and exhaust valves. We provide a special heat treatment and stress relieving