well I did the mod to my car today. drilled and tap went easy, sealed it up nice and good, and used some stainless steel fuel hose for everything but 6" going from the 'T' to the 'from tank' line. everything went fine except the #1 cylinder harness got pinched and unclipped, so I had to rotate the injector and plug it in from the top.

cueball, I'm sorry you didn't have time for it this weekend, if you have any questions, or want some pictures of my newly made dffr, just ask.

 

Something else to think about.

If your running a half decent ECU you can add extra fuel to individual cylinders.

I did some quick tests with my EMU, adding fuel to individual cylinders, didn't make the slightest difference to my knock threshold by adding fuel to #4.