my buddy has a 928s in good condition and our neighbor swore up and down his old pos s10 could out handle the porsche because "my truck is lowered in the front and raised in the rear" even though it was all stock. it also had a "fixed up motor that was done by a hell's angel mechanic. it's not a regular 2.8, it's got something extra" but the trans went out on the truck before he could prove it.
then he got an old pos plymouth fury which could beat both my cars. he wanted to race the supra, and if he could beat that, he wanted to race the g35. i told him the supra is faster than the g, and both would destroy him, but he wouldn't listen. he went on about his big block 357 (which turned out to be the original small block 360) and he also told me it had a ford power slip rear end. even though it was still a one legger, it was really fast because of his power slip.
i told him i have lsd with big 275's on both cars and that he has a one legger with a 185 tire and if he was able to get traction, there was no way he had enough power to keep up, and even if he did have enough power to keep up, he would sit and spin all day. he still didn't listen so i told him we could go run right now for $100, and all of a sudden he believed me.
so that's the most ridiculicous thing i've ever heard, but as for you, a lowered 99 truck, vs. a stock 14-20 year old car, i think it might be close. if u had any suspension work at all you would take him, but supras are not very nimble.