If there's one thing the stock McLaren MP4-12C has in abundance it's power from the mid-mounted 3.8-liter twin-turbocharged V8 engine which is rated at 600PS (592HP) and 600Nm (442.5 lb-ft).

However, Texas-based tuning firm Hennessey Performance begs to differ as it believes the MP4-12C could do with some additional horses under the hood ? 200 of them, to be precise.[...]

Source: Carscoop