Forged pistons don't allow for higher combustion temperatures persay, you could make 6-800hp on factory cast pistons as long as there is no det. Induce det and then you will have a problem with cast pistons a LOT sooner than you would with forged pistons.
So I get what you're saying, but I don't wholeheartedly agree
But yeah, factory setup with a few critical mods (oil supply/return etc) should see it live a long healthy life.
Oh and I'm still baffled by the 3L will be too torquey comment