I mean, it's Forza so probably. However, I know at least one person is putting out 650+ horsepower with their twin turbos. So it can totally be done.
this one puts out 1,059
it isn't really fair to compare them though. the engine in it was swapped for the GT-R's
and there are like three different sets of body pieces
stock

sorta reserved nismo

and odd and ugly nismo

but that one is on the highway and it was at 217mph. I got it up to 218 a few seconds later but that appears to be its top speed (I can't find out for sure because this game doesn't have the benchmark feature like forza 4 did. ugh)
and it slides around like nobody's business. so the brakes are bad too. but it's fun
also I don't even care it's still cars
so here's more forza

cutie little FR-S. styled after a certain webcomic character that can be seen to my left
and here's my BMW Msomething or whatever that I put a buncha polka dots on it bc idk??

just one more!!
this time it's my lancer that for some reason brakes in a really weird way

other than when braking it has decent grip so idk what's up