It's been quite a while since we heard news on the Dodge Challenger, but today SpeedFactory announced the SF600R tuning package for the muscle car. If a potential customer wants it, however, they'll have to pay an extra $73,900.

The SF600R uses a SpeedFactory hi-performance, normally-aspirated, bored, stroked, and balanced 6.1L Hemi block that develops a total of 600HP. This bump in power is substantial considering the Dodge Challenger only packs a punch of 425 HP and 420 lb-ft of torque. This incredible engine is mated to a 6-speed manual transmission.

The package also includes a CARB-certified high volume air intake and Corsa stainless steel cat back exhaust system. The interior will see premium leather seats and door panels embossed with SpeedFactory branding as well as custom floor mats. The Dodge Challenger will roll out on premium Michelin Pilot Sport PS2 tires mounted on 20" BBS Black Edition CH-R flow-formed wheels.

The Dodge Challenger by Speedfactory is available for immediate delivery.

Press release after the jump.

Press release

SpeedFactory, the leader in modern Mopar supercars, today announced the industry's first 6spd manual, 600 HP ‘SF600R' Challenger, as part of their complete line of 2010 Mopar supercars.

The ‘R' designation in the SF600R Challenger denotes a SpeedFactory hi-performance, normally-aspirated, bored, stroked and balanced 6.1L Hemi block, increasing the displacement to 426 cu. in. (7 liters).

This modern 426 powerplant has an all-forged rotating assembly and features CNC ported aluminum heads with new valves, guides, seals, Bee Hive springs and titanium retainers. A custom Comp hydraulic cam along with an 85mm throttle body works 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.

Additional SpeedFactory performance modifications include a CARB- certified high volume air intake and Corsa stainless steel cat back exhaust system for better breathing. The increased power is managed with a Centerforce clutch and a Getrag IRS with 1000 HP half-shafts. Handling is improved with performance springs and sway bars as well as additional front and rear strut tower braces. The SF600R Challenger rides on premium Michelin Pilot Sport PS2 tires mounted on staggered 20" BBS Black Edition CH-R flow-formed wheels.

The SpeedFactory Signature package is also included on the SF600R and features a serial numbered plaque along with SpeedFactory exterior badging and graphics. Inside the SF600R features premium leather seats and door panels embossed with SpeedFactory branding as well as custom floor mats.

On the addition of the SF600R Challenger to the SpeedFactory line-up, Mike Brillanti, President, SpeedFactory Cars stated "This car offers supercharged power in a normally-aspirated, 6spd manual package. It's a true enthusiast's car and it enables us to widen the appeal of SpeedFactory products to now include a 600HP vehicle for those enthusiasts who prefer a ‘normally-aspirated' powerplant. We offer the SF600R with either a 5spd automatic or the 6spd manual transmission. "

The 2010 SF600R Challenger is priced at $73,900. and is available for immediate delivery.