How to find out if tuned supercharged MUSTANG Shelby GT500 has 800HP for real?! The first and most common source of this information is that the horsepower number are declared by the tuning designers themselves, based on the replacement parts and modifications that had been made.
The second way is to put the vehicle on Brake Tester and to let this tester to determine the actual number of engine horsepower with the necessary corrections to the results obtained for the loss in transmission.
There is also another way, which is a simplified variant of the second and is for those who are not doing mathematics best – if the engine explodes during the test, you really have 800HP.
All jokes aside, this is what the tuners of this unfortunate Mustang Shelby GT500 claim in the video below: