RC 50CC Injectors This is the set of six RC 550cc fuel injectors. When working be sure to cover your intake. Be sure to get new O-rings. You can use a bit of chapstick to help the new rings seal and stay still. To insure a nice snug fit, file the ends of the rail down just a hair. A lot of guys compain about the fit and this is the fix. Thanks to my bud James for the tip and the install help. Here is a shot with the plenum and the fuel rail back in place. The injector harness is still off. The 550s brought my IDC from 114% on the stockers at 15lbs to 85% at 17lbs on my 13G trim turbos.