Blow Off Valve Upgrade Kit RX7 FDThe Pettit Racing Blow Off Valve Upgrade Kit is one of our top selling upgrades for the twin turbo RX7 FD. The 1" ports are twice the size of the stock valve which It's a direct bolt on replacement, and installs in under 30 minutes. Most original plastic valves are really old and typically no longer work properly, over time heat cycles and normal use cause the diaphragm to harden, which impairs both valve operation and response time. Our upgraded Blow