Don't take what I'm gonna' say as an insult..
without some sort of traction aids, good shocks, no sway bars etc.
especially on street tires
it wouldn't probably do 11's very easily
especially with a 4 speed
not to say if it really did have that power,
that it couldn't run better, even in the lower 10's
if it is set up properly, good air traction etc., with 550hp it could
tuned properly on a prepped track it may
if it really has 500-550 hp
if it can transfer the weight, hook/bite
& the driver can shift & launch it properly
Best & Wild *** guess
I'd say high 11's at best, that's optimistic,
IMO more like mid 12's as is,
& that's if it's all right, if it can hook sooner than later...
Much of your ET is made in the first 60ft-330ft
MPH is HP, the ET is car set up...
most all those calculators are for race conditions
what if best conditions, good & properly tuned
race prepped car/with slicks, everything done right,
on a prepped track, at sea level, etc.
usually cal. at rear wheel HP too, not gross (but you can figure that in too)