There are admittedly many issues with such a claim. We've seen objections raised on nearly every facet. However it is not super far-fetched to simply make 5000HP, given enough displacement, forced induction and a stable fuel. The material technology is there.

Referencing Nitro Powered TF cars and the like as a comment on it's practicality somewhat miss the mark when you acknowledge a few things.. they are limited to only 500CID and a specific blower/pulley combination. Yes, I typed "only 500CID" with a straight face.

Remember this is a hypercar, low production and won't be doing 15,000 miles a year commuting.

Then there are statements about the tires, and how they will hold up @ 348mph. Well, if you can find any place in the world that is not a salt-flat where you can even approach those speeds, it would be a legitimate concern. Even then, being my chosen sport is Land Racing.. you would do well to learn that GoodYear sells tires that are rated for 300+ mph with a healthy gross axle weight rating.

No, the biggest problem with a 5000HP car that will be running for more than a quarter-mile with any appreciable amount of throttle is simply managing the heat produced.

A spark-ignition piston engine making 5000HP at the flywheel, is wasting 2-3 times as much to heat. Heat from combustion, from internal friction, etc.

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This heat has to go somewhere, and has to be dealt with somehow. This is accomplished via heat exchangers. They Veyron, an actual car, producing near-as-makes-no difference 1000BHP has 10 of them. For engine coolant, engine oil, transmission fluid, each of it's 4 turbochargers, etc.

The Veyron's W16 produces about 3000BHP worth of heat energy, only a third of which propels the two-ton behemoth down the road. That ~33% is actually fairly efficient for a spark ignited engine.. lets humor the 5000HP claim for the "Devel Sixteen" just a moment and pretend it exists AND that it is as efficient as the VAG group's halo powerplant.

It then has to deal with safely providing controlled cooling for ~10000HP or about 7.5 MILLION Joules/sec!

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Of all the challenges involved with such a powerplant, this is the biggest and most unlikely to have been achieved for a road going car.