The Stage 3 Kit for the 5.0 litre Miami engine that powers the GT and GTP addresses the limitations of the non-intercooled engine, it's fuel supply and allows it to run more boost to take the power over 500kw. The Stage 3 kit includes the following components:

SCT Xcal 3Ford Flash Tuner
High Flow Twin stainless steel exhaust
High Flow Injectors
Engine Pulley Kit
Miami Intercooler system