Its not a big job but can be wery time consuming if not did it before! Valve is not located on the pump. but it sits on the fuel rail over the injectors. What makes this a hard job is that it sits under the intake manifold. you need 14 and 17mmm crow foot and elbow grease. Some beers will also help in patience
Its possible to do it yourself! but some experince is good.
You mean can you run it with the RS4 valve witouth mapping for it?
There is no problem to run with the RS4 valve witouth mapping for it. This valve is only ther for safty reasons. the N276 valve on the top of the HPFP do the regulations.
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