Buying a Subaru wrx 2007 modded

I'm looking at buying a wrx, but it has
about 22,000 dollars into it, it has a little
less than 60,000 original miles, and the
modifications only include a bunch of stuff,
but has stock block, so pistons and all that
hasn't been touched, but at 46,000 miles it
had a tune for 18lbs of boost, it was
pushing like 360hp, and 22lbs for 400hp,
now is that rough on a stock 2007 wrx
engine? Also has jdm 6speed