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hi
does anyone know which injectors to use for around 400hp on an s4? thanks

630cc in mine. approx 430bhp

ok thanks, do you know what make or whose injectors they are?

mrc injectors

RS4 injectors will get you to 400bhp. <£100 second hand.

Not much room for future power increases though, so keep that in mind.

You should be able to get 400 on stock injectors but on a very high duty cycle - no headroom. As Scott says, you can get
more out of RS4 injectors but you have to be careful as the spray pattern is wrong which can lead to bore wash and other
problems. Also, would you fit second hand injectors without getting them serviced? My advice would be to get a new set
from a tuner which knows what they are doing. The 630cc injectors aren't as expensive as you might think.

does anyone know if the rc developments injectors are any good- 550cc or 650cc?

I have some practically new set of 550cc Genesis Injectors. Their spray pattern is supposed to be like standard! PM me if interested.

RS4 for me was perfect.
Now I use 630cc Siemens e it doesn´t seen so perfect. But could be the mapping.