Heard they're both making close to 1,000rwhp. Doesn't look like they are launching them to hard, due to breaking tranny's and exploding rears. I got to look at the rear out TSP's black 05 C6 that had twins and made like 99xrwhp. It was pretty ****ed, but I have heard that the 06 and laters have a more beefed up rear.