How fast are Grand Nationals>

I just worked at a dudes house that claims his GN on nitrous and methanol with race gas went 6.9 in the 1/8 . I dunno, are they capable of <11 seconds on a 150HP shot and meth @ 29 lbs boost? He had the slicks in the corner and they looked pretty worn...He said he did one pass at Irwindale and they showed him the door, too fast for no rollcage or other stuff..What do you think?