That 3800 V6 Supercharged engine is the same engine I have in my wife's Buick Regal GS, however the newer years are rated a tad higher. I will say the engine supercharged does have some pep in it. Although it can just about keep up with 99-04 Mustang GT, a 2005 should easily kill it. The Monte Carlo SS, Buick Regal GS, and Pontiac Grand Prix GTP are all using the equivalent motor with SC. All are about the same performance and all of them are about the same race, assuming no modifications of course. That supercharger is putting about 6psi of boost in the engine and I know some friends with GTP's that are pushing them up with pully changeouts and minor modifications and getting up higher to 300HP.
Stock, no question, 05 win. Modified, who knows. It his kind of squirrely to launch the FWD as well (tends to pull to the right on our car mildly on hard launches), even with the stock SC'ed engine. So 300HP or so should be even worse...