Hell, I've had 12.8s w/ my G&G ST-10 & my old 400 combo.
Can't wait to see what the 440 will do!
My stock ST-10 has been very reliable over the last 4 years going from high 12s right into the 11s with a 1.72 60ft. in a 3700 lb car.
I would hope a TKO 600 could handle much more than 11.67.