Drifting is the place to be if you are interested in absolutely crazy powerful engine swaps. For example take Swedish drifter Martin Enmar’s twin-turbo Viper V10 powered RX-7. This monster puts down so much power it broke a dyno machine. The last reading they got was 900 rwhp at 10.8 psi of boost.
Source: Driftlab via Speedhunters