It isn't exactly a perfect
It isn't exactly a perfect comparison. Tesla's car is a luxury Sedan. Chevrolet's is a muscle car. It's like comparing a $50,000,000 private jet to a MiG. If you want a race car, the Chevy wins hands down, but most people who want race cars don't buy them with 5 seats. The winner here is whichever one can be the jack of all trades. Personally, I'd say that that is the Tesla, although the fact that it costs twice as much may have something to do with that.
And if we were to remove the speed-governing and change the rear-end ratio (or add a transmission, something that Tesla really needs to consider doing), the P85D would be EXTREMELY fast, in terms of top speed. Treading far into hyper-car territory.
Calculations seem to indicate a top speed of somewhere between 250 and 255 MPH, putting this fictional-but-plausible modified Tesla in an entirely different tier of insanity than the Hellcat. This is due to aerodynamics. The Tesla's Coefficient of drag of 0.24 is almost literally second-to-none (Mercedes has claimed 0.22 on I forget which car, but when tested, it was a modest 0.31, while the Tesla's was 0.24). Basically, A Tesla has 70% the power and 70% the drag area of a basic Bugatti Veyron, which should give it a similar top speed.
Of course, even 155 mph is an insane top speed on a road. Really, no top speed over 170 is probably even remotely practical anywhere but long, empty stretches of the Autobahn.