Well a stock s15 runs 14.8 1/4 mile. I highly doubt an sv6 would come close to that considering stock ls1 Monaro's/commodores are reported at approx. the 14.5 mark.
On another note (unrelated to any post), if the brz/86 handles anything like an mx5 (which it supposedly does) - it'll be one fun car to drive/own. There are a lot of haters on here who bag out mx5's, but Im sure that most people on here haven't driven one.
There is no doubt that a v8 is nice to drive (I have one) but I also have an mx5 and as gay as many think they are, they're a lot more fun to fling around the bends.