Found a crack in the end of one of my injectors, while the intake is off should i leave it or replace it, was running fine.
Yeah get rid of it... My mate put a supercharger on his car not so long ago and it was running like a dog. Turns out it was because of a cracked injector and a missing O-ring. Even if its running fine, lob it, it will play up sooner or later....
Replace it. Anything near fuel under pressure should be in tip top condition. Complete failure will mean a flash fire under your bonnet which will most likely take the car with it.
Reaper