the old type grey injector is a bit of a dinosaur has a very large pintel the 83 lb semens is alot finer even thow it flows more karl got my co down to 1.26 for the mot with out closed loop wired up as karl dont agree with it as it causes excess heat on cooling down laps on track days
its cheaper to get 1000cc injectors and check them out than it is to buy a set greys