Hennessey Performance has created their first aftermarket upgrade package for the 2011 Chevy Camaro Convertible, which they call the HPE600 due to the fact the the supercharged V8 plant from under the bonnet has been dialed up at 602 bhp and 605 lb-ft of torque thanks to a long list of modifications.
Besides the power boost of nearly 200 horses, the Hennessey HP3600 Chevy Camaro Convertible has also received an adjustable coilover suspension system from KW which can lower the car’s center of gravity by 1 inch, along with wider 20 inch double spoke design wheels riding on Michelin Pilot Super Sport tires, a carbon fiber front splitter and new side sills.
The result is quite impressive as the Hennessey HP3600 Chevy Camaro Convertible sprints from 0 to 60 mph in 3.9 seconds and runs the quarter mile in 12 seconds at a speed of 118 mph. 
The basic price for the Hennessey HP3600 Chevy Camaro Convertible is 56,495 USD and reaches 74,950 USD when all of the available goodies get added. 
Hennessey Performance press release :
SEALY, TEXAS – Hennessey Performance (HPE) introduces the company’s first 2011 HPE600 Supercharged Camaro convertible. Pounding the pavement with a 602 bhp supercharged V8, the HPE600 is also the first 2011 Chevrolet Camaro convertible to hit the streets with a full treatment of aftermarket performance upgrades.
Hennessey began offering its power-addicting upgrades to the latest Chevy Camaro when the car was introduced in April of 2009. Since that time, HPE has built hundreds of Camaros with over 550 horsepower for owners across the globe.
"We were excited to receive one of the first 2011 Camaro SS convertibles from Chevrolet," says company founder and president, John Hennessey. "It was only natural that we would take the new Camaro SS convertible and upgrade it with our very popular HPE600 Supercharged upgrade. If having a 602 horsepower Camaro is cool and fun to drive then being able to drop the top takes the sensation of speed and the classis sound of American-muscle to a whole new level."
The 2011 HPE600 Supercharged Camaro convertible puts its additional power to the ground with the help of a lowered (1 inch) KW adjustable coilover suspension system. Combined with wider 20 inch wheels (9.5 x 20 inch fronts, 10.5 inch rears) riding on Michelin Pilot Super Sport tires (275/30-20 fronts, 305/30-20 rears), the HPE600 Camaro convertible is capable of going from 0-60 mph in just 3.9 seconds while running through the quarter mile in 12.0 seconds @ 118 mph.
"The new convertible Camaro is about 250 lbs heavier than the hardtop," states Hennessey CEO, Don Goldman. "But when you add nearly 200 horsepower, it more than makes up for the increased weight. When you are cruising down your favorite road with the top down, the combined sound of supercharger and exhaust makes it all worth it!"
The base cost for the HPE600 Supercharged Camaro convertible is $56,495 (base Camaro SS convertible MSRP of $40,500 plus $15,995 for the HPE600 Supercharged upgrade). All HPE600’s come with a 3-year / 36,000 mile powertrain warranty from Hennessey. All-in, the HPE600 Supercharged Camaro convertible with upgraded wheels, tires, suspension and CarbonAero™ carbon fiber front splitter and side sills costs $74,950 plus tax, title and license.
Camaro hardtop and convertible owners can send their vehicles to Hennessey facilities located near Houston, Texas and Lake Forrest, California. New vehicles can also be purchased through authorized Hennessey dealers such as Parkway Chevrolet (www.parkwaychevrolet.com ) in Tomball, Texas.
2011 HPE600 Supercharged Camaro Convertible
Vehicle Specifications
Power:
• 602 bhp @ 6,300 rpm
• 605 lb-ft torque @ 3,800 rpm
HPE600 Supercharged Upgrade Includes:
• TVS2300 Supercharger System (Black)
• HPE Cold Air Induction System
• Stainless Steel Long Tube Headers
• High Flow Catalytic Converters
• Stainless Steel Mid-Pipes
• High Flow Fuel Injector Upgrade
• Professional Installation
• HPE Engine Management Calibration
• Dyno Tuning & Road Testing
• Hennessey & HPE600 Exterior Badging
• Serial-Numbered Dash & Engine Plaques
• Hennessey Premium Floormats
• Hennessey Embroidered Headrests
• HPE Modified Engine Cover
• 3 Year / 36,000 Mile Limited Warranty
Options Include:
– CarbonAero Front Splitter (real carbon fiber)
– CarbonAero Side Sills (real carbon fiber)
– Hennessey / KW Variant 1 Suspension Upgrade (lowered 1 inch)
– Hennessey Blue Hood Stripes
– Hennessey 3-Piece Alloy Wheels (20×9.5 in. front, 20×10.5 in. rear)
– Pirelli P-Zero Tires (275/30-20 front, 305/35-20 rear)
– Hennessey Carbon Fiber Door Sill Plates

Video: Hennessey HP3600 Chevy Camaro Convertible

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Source: Hennessey Performance