My MS3 had this mods, 3 "Magnaflow Exhaust, SU Test Pipe, Injen CAI, Cobb Turbo Inlet, Dual Port blow off, ITV22 Spark Plug, ETS TMIC, Rear SU Motor Mount, which I would recommend the following mods.
+1. I'd also make sure that the BOV is set to full recirc, and with your mods, I'd go back to stock heat range plugs. At stock boost levels or aftermarket tune (AP) or without a catless dp, you are more likely to foul those colder plugs than get any benefit from them, IMHO. Hotter is better. Usually you have to have an increase in power of 40-50 hp over stock or a higher than stock boost to benefit from colder plugs.