Yes unless you plan on running the boost a T34 can produce then there would be no point in uprating.

Tbh stage 2 isn't really heard of anymore, if it were me I would go for uprated injectors Bosch or Siemens 55LB a 3 BAR MAP sensor and yes the T3 will produce the boost, at the moment you are probably running around 15PSI, I should think you would see circa 310HP with this setup but more importantly more torque as well.

Martin