i have a paxton SN series on my 87 iroc.
i went from a 14.616 before to a 13.901 for my first trial run, no other mods. And at the time, i had some belt slippage problems, a beat tranny that didn't know what it was doing, and pretty much no tuning done.
over 7 tenths right off the bat, and i had a ton of issues. I think willie got a full second with his paxton of the bat, and I'm sure i could definitely have matched that and gotten to a 13.5-13.6 if i had just worked out the problems and ran again as is.
But i couldn't leave it alone, and i i now have a built tranny with a 2500 stall converter, slp headers, and a few other mods since then too.
and i have a t56 and DFI ready to install, and a holley stealth ram ordered. I don't leave the car alone long enough to go to the track
anyway, the paxton is the crappy blower setup too, pretty much all the other setups are gonna make you more power...