Speedfactory 426/440 Challenger Packages

Stage 1 Normally Aspirated

Full performance workup including:

• Speedfactory Cold Air Intake
• "Cat Back" Performance Exhaust
• Speedfactory Stage 1 Tune
• 20" staggered forged wheels
• Speedfactory interior and exterior appointments
• 3 Year / 36,000 mile warranty (motor only)
• Example: 6.1L 425 HEMI increases to almost 500 HP (crank).

Stage 2 Normally Aspirated

Full performance workup including:

• CNC Matched Intake Manifold and Heads
• Headers
• 90mm Throttle Body
• Speedfactory Cold Air Intake
• "Cat Back" Performance Exhaust
• Speedfactory Stage 2 Tune
• 20" staggered forged wheels
• Speedfactory interior and exterior appointments
• Example: 6.1L 425 HEMI increases to 530 HP (crank)

Stage 3 Normally Aspirated

Complete motor rebuild:

• Big block conversion to a 426 or 440 (depending on existing configuration)
• Stock motor is bored and stroked
• New high performance racing parts including pistons, rods and crank
• 20" staggered forged wheels
• Speedfactory interior and exterior appointments
• 3 Year / 36,000 mile warranty on some configurations (motor only)
• Typically a 6.1L 425 HEMI increases to 600+ HP (crank).

Stage 1 Supercharged

Full performance workup including:

• Vortech Centrifugal Style Supercharger with 5.5 lbs of boost
• Speedfactory Stage 1 Dyno Tune with certification sheet
• Cat back exhaust
• Speedfactory interior and exterior appointments
• 3 Year / 36,000 mile warranty (motor only)
• Example: 5.7L 345 HEMI increases to 470 HP (crank)

Stage 2 Supercharged

Full performance workup including:

• Engine re-worked with forged internals, billet main caps, ATI crank pulley and 8.1 compression ratio
• Vortech V3 supercharger system with custom boost configuration and Speedfactory air intake (no warranty on boost configurations over 5.5 lbs)
• Speedfactory Stage 2 Tune (dyno tuned for 700 HP)
• 1000 HP axle shafts
• Exhaust system
• Speedfactory interior and exterior appointments
• Options such as forged wheels, tires, brakes and rear end components are also available.
• Example: 6.1L HEMI at 425 HP can improve up to 700 HP.

Stage 3 Supercharged

The ultimate package! Build the ultimate super powered car you have always dreamed about!

• One on one consultation to determine your specific interests
• Pricing and specifications vary dependent on your specific configuration

Build options include:

• Complete motor rebuild
• New extreme performance racing components including billet crank, pistons and rods
• Lowered compression
• Custom boost configuration
• Optional Big Bore Kit conversion to a 426 or 440 Supercharger (depending on existing configuration)
• 1000 HP axle shafts
• Exhaust system
• 20" staggered forged wheels
• Speedfactory interior and exterior appointments
• The end result is your ultimate driving machine!