Find out more about the new tuning package for the Dodge Challenger from SpeedFactory, out of Atlanta, Georgia. The story inside.

American tuners SpeedFactory have increased the output of the Dodge Challenger SRT8 from 425 hp to 600 hp (447 kW / 608 PS) without the use of a supercharger. 

Starting with the standard 6.1-liter HEMI engine engineers increased the displacement to a full 7.0-liters (426 cu in). In addition to a higher volume air intake system matched with a stainless steel Corsa exhaust , SpeedFactory also used "a custom Comp hydraulic cam along with an 85mm throttle body with a CNC machined stock manifold that is port matched with a blended plenum to produce a dyno-proven 595-605 HP on premium-grade 91 octane pump fuel," the company states in a press release.

Equipped with a six-speed manual transmission, SpeedFactory also adds a Getrag IRS and Centerforce clutch, as well as a few other goodies.

The engine is not the only thing to get an upgrade on the car.  The vehicle's handling is buffed up with performance-grade springs, added struts, and new sway bars.  20-inch BBS wheels are wrapped in Michelin Pilot Sport PS2 tires.

Leather seats, leather door inserts, custom floormats and various badging round out the package.  The 2010 SF600R Challenger is now available, and costs $73,900.

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