hi,
i dont have the measurements off hand, but i can measure tommorow.
i had them checked when i got them and beleive they are rated around 900hp
i had them polished for someone who wanted to buy them, but pulled out.
yes single wastegate, i have only trial fitted them on car.
i never used them as i was offered a good deal on another setup about a year ago when i was building the gtr.
i have a few more pics, if u give me email address i can send to u.