Last November, John Hennessey got his hands on the first ever US-spec McLaren 600LT finished in black with subtle orange accents. Of course, we all know it would only be a matter of time before the Texas tuner made some significant modifications to the lightweight McLaren Sports Series.

In stock form, the McLaren 600LT's 3.8-liter twin-turbo V8 engine pumps out 592 horsepower and 457 lb-ft of torque, enabling the Sports Series to deliver supercar levels of performance. 0-62 mph takes just 2.9 seconds before the car tops out at 204 mph. Thanks to its extreme aerodynamics, a stiffer chassis, and a more powerful engine, the 600LT is the fastest, most powerful and most track-focused McLaren Sports Series yet, but the team at Hennessey Performance has promised to "increase its power even more."

The tuner's latest project hasn't been revealed in full just yet, but some new photos and details hint at the extra power under the hood of Hennessey's modified McLaren. It also now has a name: the HPE800.

This suggests Hennessey's McLaren 600LT will have at least 800 hp on tap, which is over 200 hp more than the stock car and matches the output of the Cadillac Escalade, Jeep Grand Cherokee SRT8 and Dodge Charger SRT Hellcat with HPE800 monikers. If so, this would make the McLaren 600LT more powerful than its 720S and Senna siblings, which have 710 hp and 789 hp respectively. The extra power should also knock off a few tenths of seconds off the 600LT's straight-line performance.

McLaren hasn't said how many 600LT Coupes and Spiders it intends to build, but production will be limited to one year. By comparison, the fixed-roof 675LT was limited to 500 units, while the spider variant finished production after 500 units were built. Prices for the McLaren 600LT start at $240,000, but Hennessey's HPE800 performance package will likely raise that figure beyond $300,000.