HPF STAGE 4 | 420kW

Product Code: #300C 6.4L HPF STAGE 4 | 420kW
Install Time: 3 Days
Model Compatibility: 300 SRT 6.4L
Note: This product can only be fitted at Horsepower Factory in Dandenong
Note: This product can only be fitted at Horsepower Factory in Dandenong


469 hp
563 hp
94 hp
637 Nm
470 ft-lb
700 Nm
516 ft-lb
+63 Nm
46 ft-lb

300 6.4L | HPF STAGE 4 | 420kW

The Chrysler 300C 6.4L Stage 4 upgrade starts with our trained technician removing the engine from the vehicle and disassemble it to replace the factory camshaft with a high performance Comp Camshaft and fit a phase limiter kit, we then replace the MDS Lifters with Hellcat units and fit upgraded valve springs to the cylinder heads and reassemble the engine with new head gaskets and head bolts.

We then fit a high flow HPF Cold Air Intake System which out flows the standard air intake by around 35%, 4-1 Stainless steel extractors, high flow metallic cats & a dual 3" Stainless Steel catback exhaust to increase the engines breathing capabilities.

We then custom tune your vehicles ECU on the dyno utilizing the latest ECU tuning software to maximize power and fuel efficiency. We complete the upgrade process by testing your vehicle on the road to make final adjustments, optimizing your vehicles performance and driveability. This is all completed in 2 days and at the end of this upgrade you will provided with a dyno graph detailing the power & torque increase of your vehicle.

Package Includes

1 x Custom ECU Reflash
1 x Comp Camshaft (270WI16) 222/230-115 .615"/.609"
1 x Comp Cams Phaser Limiter kit (5761)1
2 x Head Gaskets
1 x Set of genuine head bolts
1 x NON-MDS Lifter kit(Hellcat lifters)
1 x Set of PSI-L1511ML Valve Spring kit
1 x HPF Cold Air Intake System
1 x 4-1 Stainless Steel extractors
1 x High flow metallic catalytic converters
1 x Dual 3" Stainless Steel catback exhaust
1 x Oil, coolant, filter
1 x Custom ECU - reprogram
1 x Before and after dyno graph
1 x All labour to fit / tune / test

Key Features

Good power gains, noticeable power and torque increase across the board, with zero down sides.


  • *Please note: Power figures are estimates only and actual figure's may vary.
  • We recommend all vehicles coming to HPF for tuning run 98 Octane fuel. Please contact us if you have a need to use different fuel.
  • Power figures listed are estimated kilowatts at the flywheel based on results typically obtained by HPF on HPF’s dynos. Typically these are based of a manual vehicle with standard driveline and standard wheels and tyres. Actual power can vary based on each specific vehicle.
  • Modifications such as this package require the vehicle to be in excellent mechanical order.
  • We advise against increasing the power output substantially on high kilometer engines, if your engine has in excessive of 150,000kms please contact us to discuss options.
  • Whilst every attempt is made to ensure prices listed online are correct, they are subject to change at any time.
  • Additional parts may be required in some cases depending on the condition of the vehicle. Cost of these parts and additional labor required may incur additional cost.
  • Images are for illustration purposes only

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