Money and research. If you do your homework and put your money in the right mods, both skylines and XRTs can be as quick as each other. The 6 speed auto Ts are a bloody quick car standard, so its just a matter of throwing a few more KW into them. The real challenge is for the manuals. Getting 1800kg (some more) off the line is the key. The right combo of clutch,tyre,launch RPM and power is far harder to achieve. So IMO this comparison of skylines and XRT should be just manuals and 2WD only. Stock 32GTRs can run mid to high 11s, you would need to spend a fair bit of coin to get a GTST to run a time like that. At the moment I think a stock XRT could get me off the line as I spend all my energy just trying to keep the wheels from spinning in the first 3 gears. As for me the next round of mods will in in the suspension. At the latest Wholesale Suspension open night it was very clear that my neg camber is a little too much for the power level, would be fine for something mildly modded but now I need as much tyre on the road as possible. I will also be going to street slicks :( At the end of the day if either car is setup right it comes down to the driver. Maybe should have a skyline VS XRT day at WSID lol