Hennessey HPE1000 kit boosts the power of the 5.2-litre V8 from 387kW to a whiplash-inducing 735kW - a cool 1000 horsepower.
'Unchained' version of newly-retired Porsche 919 nearly a second quicker around Spa than Hamilton's F1 Mercedes.
Based on Shelby Super Snake, the modifictions improve the muscle car's traction and handling.
Vettel has history on his side as Ferrari dreams of a first world title since 2007, but Mercedes is ready to bounce back in China.
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