1. Ariel Atom 500 V8

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Earlier on this list, I mentioned the Hayabusa engine in the Radical SR1 was a popular platform for car transplants. Well, if one Hayabusa engine is good, then two must be even better! That’s just what we have with the Ariel Atom 500 V8. Hartley Engineering built this bespoke 3.0-liter V8 specifically for the Atom by mating two Hayabusa engines together. Specifications include dry sump lubrication, forged internals, individual throttle bodies and sequential injection. It even revs to 10,500 rpm. All this is good for 500 hp and 284 lb-ft. Consider the Atom only weighs 1200 lbs, and we’re talking 2.3 seconds to reach 60 mph. In case it wasn’t clear by now, the Ariel Atom 500 V8 is a wild beast, delivering a kind of visceral sensation of performance unseen even on most motorcycles. To experience anything faster will likely require a racing license. Unfortunately, only 25 Atom V8s were made, and even at $225,000 they are all spoken for.