Okay, hope nobody minds. but I'm jus' gonna recycle an old one on this topic:
I've gotta admit that I'm probably a "Mustang-kinda-person" at heart. They make predictable, easily-used horses like you were turnin' an electric dial. Very easy (n' gobs of fun) to steer with your gas pedal in the corners.
It's certainly a more practical package than Stewie if you've need of more than 2 seats some of the time n' there's no comparison comin' away from a stop. And the last time that I paid attention the price is easier to deal with too.
Driveability-wize it's a much easier car to COMFORTABLY bring closer to the edge of it's abilities than Stewie.
I, personally, can't find alotta fault with it n' if I could have both a 'Stang n' Stewie too I would. If your reasons point to the 'Stang I don't think that you'd be makin' a mistake.
Oh, yeah . . . there's always the 2006 Gargonzolla r' the Baluga, but bang-for-the-buckwize, you'd be hard pressed to find anything as worth the bucks as the 'Stang.
N' this is current: While I know that the the well dressed (better tires/suspension/engine/trans) Mustang may not have the composure of Stewie goin' through a chicane at real speed, I'd be very,
very surprised if the end results (times) weren't extremely similar.
And for the record, I'd be willin' to donate the time to testin' this suspicion should anyone be willin' to allow the use of their cars. Hell! For an opportunity to throw those two around, back-to-back? I'd spring for airfare n' commemorative tee-shirts!
And with all due respect to more current racers than myself, I've found that flatter doesn't always translate into faster.
Be well.