It's possible but i think it'd need cams on the spec below to make those figures.

3" stainless downpipe and decat exhaust
Indunction kit
Walbro fuel pump
remap

Generally remapped Evo 5's and 6's make 350-370bhp and 320-360lbft at around 1.4-1.5 bar on a standard engine and turbo.

Mine made 365bhp/345lbft @ 1.4bar, but the turbo is really on its knees at that level, to be fair little gains are to be made with more boost.