i had exactly those mods on my 33 and got 270hp on xspeed dyno, 260hp on c-red dyno.
boost was .9 bar, my turbo went bang after 30K km's.
i don't think you could get 300hp with those mods.
i have since put injectors, 040 and garrett gt30 on the car and got 340hp on c-red dyno.