SVT easily.
The GT "should" beat it out of the hole but after 30mph the SVT walks it badly.
"Bench" racing the SVT is nearly a second faster in the 1/4 mile. That's a ton of car lengths or not even remotely close at the end.
In an "illegal" stop light battle the GPGT would be tough because it's brainless to launch and has a lot more torque for only a couple hundred pounds more weight.
