With decent mapping you can go bigger without problem, colour doesn't on bosch injectors mean a thing, just more like a common way to distinguish for cossie people.
They don't need to be turbo injectors, if needing high impedance you can use low with a resistor in each earth line to give you more choice.
Work out your bhp then size accordingly, there's loads of tripe about about siemens being superior, but 4 years on I'm still waiting to see evidence, indeed watching spray patterns I don't see a major difference, and where I've known people switch from bosch to siemens there doesn't appear to be any difference.
Take the injector flow in cc/min divide by 5 then multiply by the number of cylinders this will give you the bhp potential of the injectors.
Get the injectors you want to use cleaned ultrasonically BEFORE using, this will in general drop the flow rate to what it should be but they will be all balanced then, and you will be assured of decent spray patterns as well.
If one is flowing slightly less put this nearest the water pump end of the engine, one flowing slightly more at the opposite end.
I for example run "greys" or 0 280 150 403 injectors at 300bhp, and have emissions of 0.97% CO with 137ppm, with 200k MILES on the engine but then mine was mapped by someone who knows what he is doing, despite some claiming it's been cleaned up for mot, the very low ppm show this is not the case, it runs 100% perfect can crack 40mpg as well.
tabetha
tabetha