MYbe not it surly at the moment s3 is better for flow than rs4?
GIAC is proving a mighty good power mod and they specify the RS4 injectors at the moment. If they specified S3 I would be using those.
My R is currently VERY quick, some would say too quick ( my wife
). I haven't seen another tuner in the UK who has even attempted to go as far as I have gone with a MKVI R. Maybe there are, but I haven't seen any proof that any other UK tuner is quicker, safer or stronger than what Statller and GIAC currently provide. APR have one car in Australia that has proven performance, but I believe this is also down to the man tuning the R as much as the tune on it. Then there is Teff, who's car is also more of a testament to the builder.
I cannot fault Statller as my chosen builder/tuner and I can honestly say that my car wouldn't be as strong as it is now without their dedication and support.
It is the builder that ultimately makes the car perform and you place your trust in what decisions they put forward and so individual parts like injectors, intakes, turbos etc are key to the outcome.