Originally Posted by Halon
With an SC61 You'd be going from a turbo rated at something like 53lbs/min(57trim) to an SC61 rated around 65lb/min. So I'd say you can gain a little more the 100hp. Either way, a 100hp increase is a fairly significant jump in power. This turbo is pretty comparible to a GT35.
He also mentioned he wants it to bolt in without modifying much. An SC61 will yield you noticable gains power wise, yet can come in the exact same housings as the one you have right now, so you wouldn't have to change a thing.