I ran that setup on my 03 for about 8 months before going to a 60 trim. I ran the same boost levels you are wanting to run. I gained about 30 hp and 35 ftlbs by just swapping out my S2 injectors with the S1 injectors. One thing I would recommend before doing this though is to get a wideband O2 gauge. Every car is differant and I would hate for you to blow your motor because I or anyone else said you could run this setup. I dynoed 282hp and 321ftlbs running S2 w/S1 injectors.