Hennessey Performance Engineering is still working on their tuned version of the new Dodge Challenger SRT8 and work is progressing very positively. The latest news from Hennessey is that its 2008 Dodge Challenger SRT600 Turbo can?scream down a quarter-mile in 11.9 seconds at 121 mph (video posted after the jump).Hennessey is offering two versions of the Challenger SRT600 Turbo. One produces 620-hp with a peak torque of 650 lb-ft while the other produces 650-hp with a torque of 680 lb-ft. Both get extra power from Garrett 67 mm Ball-Bearing Turbocharger, stainless steel turbo headers?and other modifications (a complete list is pasted after the jump). The 620-hp Challenger SRT600 Turbo does 0-60 mph in 3.8 seconds while the 650-hp version does it in 3.6 seconds.Other modifications include a transmission upgrade, KW adjustable suspension, Stoptech 6-piston front brakes and 4-pistons in the rear, a polished intake manifold, Hennessey embroidered head rests, 20-inch wheels?and SRT600 Turbo exterior graphics kit.Click through to see a full list of modifications and videos of the Challenger SRT600 Turbo undergoing dyno testing and its quarter-mile run.Hennessey Dodge Challenger SRT600 Turbo:???Hennessey?Dodge Challenger SRT600 Turbo quarter-mile in 11.92?at 121 mph:??2008 Dodge Challenger Hennessey SRT600 Chassis Dyno Test:Power:620 hp @ 5,200 rpm650 lb-ft @ 4,000 rpmPerformance:0 - 60 mph: 3.8 sec.1/4 mile: 11.9 sec. @ 121 mph (time slip below)SRT600 Turbo UpgradeCold Air Induction SystemHigh Flow Cylinder Heads with Polished Combustion Chambers & Lowered Compression Ratio (from stock 10.3 to 9.6)Garrett 67 mm Ball-Bearing TurbochargerStainless Steel Turbo HeadersStainless Steel 3.5 inch DownpipeSingle 44 mm WastegateStainless Steel Dual Corsa Exhaust System with Polished Stainless Steel Exhaust TipsFront Mounted Air-to-Air Intercooler3.5 in. Polished Inlet Tube with Blow-Off ValveUpgraded Fuel InjectorsBillet Aluminum Fuel Rails & Crossover Fuel LinesFuel Pump Boost-a-pump UpgradeRe-calibrated Engine Management SystemNGK Iridium Spark Plug UpgradeTurbo Oil Pump Scavenge SystemAll necessary gaskets and fluidsRed POWERED BY HENNESSEY Coil Pack CoversSerial Numbered Plaque in Interior and Engine CompartmentHennessey & SRT600 Speedometer & Tachometer UpgradeProfessional InstallationHennessey & SRT600 External BadgesOne year limited warrantyOptional Equipment:Transmission UpgradeTransmission CoolerQuaiffe Rearend UpgradeKW Adjustable Suspension UpgradePolished Intake ManifoldHennessey Embroidered Head RestsSRT600 Turbo Exterior Graphics KitNote: The Hennessey SRT600 Turbo upgrade is available for all 2008 - 2009 Dodge Challenger SRT8 models, with either automatic and 6-speed transmissions.Power:650 hp @ 5,200 rpm680 lb-ft @ 4,000 rpmPerformance:0 - 60 mph: 3.6 sec.1/4 mile: 11.9 sec. @ 121 mph (time slip below)2008 Hennessey Challenger SRT600 Turbo Includes:SRT600 Turbo UpgradeHigh Flow Cylinder Heads with Polished Combustion Chambers & Lowered Compression Ratio (from stock 10.3 to 9.6)Single 67 mm TurbochargerStainless Steel Turbo HeadersSingle 44 mm WastegateStainless Steel Dual Corsa Exhaust System with Polished Stainless Steel Exhaust TipsFront Mounted Air-to-Air Intercooler3.5 in. Polished Inlet Tube with Blow-Off ValveUpgraded Fuel Injectors & Fuel RailsUpgraded Engine Management SystemAll necessary gaskets and fluidsProfessional InstallationOne year limited warrantyOther Upgrades IncludedTransmission Upgrade with Shift KitKW Adjustable Coilover Suspension Upgrade (lowered 1.5 inches)Stoptech 6-piston Front Brake Upgrade with Light Weight RotorsStoptech 4-piston Rear Brake Upgrade with Light Weight RotorsHennessey Light Weight Polished 5-spoke Wheel Upgrade(209.5 fronts & 20 x 11 rears)305/40-20 Nitto Drag Radial Tires (rear)Hennessey Embroidered Head RestsCustom Hennessey GraphicsTags: 2008 Dodge Challenger, , Challenger, , Dodge Challenger SRT8,