I beat a few "450-500" hp cobras too with bolt on's and spray making about the same power or less than the cobras did. I beat a friends cobra, on motor, that made 460 something. he thought I was on spray until he later rode in my car on spray and then believed me.
Don't get me wrong cobras can be fast but my experience is similar to linn's when I raced cobras, especially on the highway I always beat them, they would heat soak and the gap always got bigger with each race.
I never raced any super fast ones tho, I dunno maybe I got lucky lol or had the driver mod
O and nice video both cars are quick