Correct ours is Not stock , But I did point you to a STOCK Motor tread quote with a GN running 13.8 . Correct? Now you do understand that is a Grand National and than there is a GNX with the same motor? So you have only proved using YOUR friend's show room stock(?) 500e time slip it is as quick a show room 1987 Buick Grand National and LESS quick than a GNX. Correct? So my point stands a v6 turbo buick motor powered the car that was quicker than the 500e.. No???