I ran against 2 GT's in the Coupe, one an '04 like you had & the other an '03. Both times it couldn't have been a more even race; neither of us budged against one another; perfectly dead even. The '03 was off of a light & though he gained on me initially I was door-to-door with him by 40mph. The '04 & I took off from around 35 or so & we never inched beyond each other.
In the SRT it wouldn't be a race............
The later model GT's are a little beefier & I'm afraid our Coupes would get whacked pretty easily.