new Viper, 725hp on the roller dyno!

The dyno sheet in the video doesn't show anything close to 725, it shows peak power of 554hp at the wheels (same as stock) and a nice gain across the range, peaking at 25rwhp at 5000 revs. Maybe this vid is before headwork?

That said, the headwork is probably putting another 25-30 to the wheels. at 580 to the wheels it's still far below 725 at the crank, unless you're using 25% for driveline loss which is unreasonable in these cars. 15% is the standard. Point is, unless you're running a built motor with a hot cam, full exhaust, ECU, 725 crank is unlikely on a stock motor with heads and exhaust. No way does the Gen V have 80hp tied up like that.

The Gen II cars saw upwards of 40rwhp from headers/exhaust. The factory has clearly done a nice job on the stock Gen V setup.