MSP Manifolds Stock (replace CHRAs) or 550BB turbos 3" expansion downpipes 3" - 2.5" test pipes Dual pop (Selin Translator) Ashspec IC piping and Massive ICs Then get a tune from a reputable tuner.
On pump fuel with stock turbos, there is no reason why you shouldn't be around 400hp on the above. Probably about 450+ with the 550BBs.