Injectors

There is no color code conspiration. Although I was after it and almost cracked the enigma, there is none. Maybe for some manufacturer, but even there you find remarks like "color may differ from picture" a.s.o. What you must know to identify an injector is the part-number and manufacturer, then you can search for the flow-rate, resistance and all relevant data. Unless somebody already made all the the work for you, like Stan Weiss for example. Have a look at his site here. I downloaded the list and made it available as a .pdf.
To get an approximate flow rate for a 4 cylinder engine, multiply the injector rate in cc/min by the number of injectors and then divide the answer by five. In this example: 272cc/min x 4 = 1088cc/min total available flow. Divide by five gives you 217.6 bhp. That is with the injector 100% flat out at a fuel pressure of 3 bar.  Normally you aim for 80% of total duration making the 272 injectors worth about 175 bhp at 3 bar pressure for my engine. That would be a rather optimistic calculation and my engine will not achieve that amount of power. This is not an exact calculation because it doesn't take in account other parts of the engine responsible for the power output (camshaft, valves, pistons ...).
Oh, and yes, by the way ... mine are pink !
Cheers.