theres a nitrous 6 speed that has gone 9.89 and a 6 speed lingenfelter turbo vette thats gone 9.5
i am the first forced induction f body 6 speed that i know of to do it (yes its a 6 speed), and the second m6 ls1 f body in the 9's that i know of (to allan futral (above)

1.52 is amazing for me, my previous best was on a 1.67