The Quest for 750+ Horsepower in a Dodge Hellcat

The Dodge Hellcat, with its factory-rated 707 horsepower, already delivers face-melting acceleration and an unforgettable supercharger whine. Yet for many owners, the craving for more power never truly subsides. The aftermarket has responded with a robust ecosystem of supercharger upgrades designed to push the 6.2-liter HEMI far beyond the stock output. Reaching 750 horsepower at the wheels—or more—is not only achievable but increasingly common. However, the path to that power involves real costs, careful planning, and an understanding of what each component contributes. This article breaks down every dollar you can expect to spend when upgrading your Hellcat supercharger for 750+ hp, along with the performance gains that justify the investment.

The Anatomy of a Hellcat Supercharger Upgrade

Before opening your wallet, it helps to know what you’re actually buying. A supercharger upgrade for the 6.2 Hellcat generally falls into one of three categories. Each category delivers different power levels, requires different supporting modifications, and carries a distinct price tag.

Stock Supercharger Upgrade (Porting & Pulley)

This is the most cost-effective route. The stock IHI supercharger is a twin-screw unit that can be modified by porting the inlet and snout, adding a smaller pulley, and installing a larger throttle body. These changes force more air into the engine without replacing the entire supercharger. Gains typically land between 700 and 750 wheel horsepower, depending on fuel and tuning. The cost is relatively low, but the ceiling is limited—you won’t crack 800 hp on the stock blower without pushing it beyond safe limits.

Aftermarket Supercharger Kits

For serious power, enthusiasts turn to aftermarket superchargers from brands like Whipple, Magnuson, Kong, and D3. These are larger, more efficient twin-screw or roots-style units that displace significantly more air than the factory blower. Kits range from 2.9L to 3.8L or larger, with some capable of supporting over 1,100 horsepower. The cost of these kits is higher, but they unlock a completely new performance tier. They also often include intercoolers, larger throttle bodies, and fuel system upgrades.

Centrifugal Supercharger Kits

Less common for the Hellcat, centrifugal superchargers (like those from Procharger) bolt on as an additional or replacement unit. They offer linear power delivery and high peak numbers, but they require extensive custom piping and often a different tuning approach. For most owners targeting 750+ hp, the twin-screw route is simpler and more proven. Centrifugal kits are usually reserved for those chasing 1,000+ hp with a dedicated race build.

Detailed Cost Breakdown

Below is a realistic breakdown of costs for upgrading a 6.2 Hellcat supercharger to the 750+ hp range. Prices are based on current market averages and assume professional installation and tuning.

Supercharger Upgrade Options

  • Porting & Pulley (Stock Blower Upgrade): $1,500 – $3,500. Includes porting, pulley, larger throttle body, and gaskets. Some shops include a custom tune in the price.
  • Entry-Level Aftermarket Kit (2.9L – 3.0L): $4,500 – $6,500. Typically includes supercharger, intercooler, snout, and installation parts. Brands like Magnuson or Whipple.
  • Mid-Range Aftermarket Kit (3.2L – 3.6L): $6,500 – $9,000. Larger displacement, often with upgraded bearings and billet rotors. Kong Performance and D3 are common.
  • High-End Aftermarket Kit (3.8L+): $9,000 – $12,000. Race-oriented kits with massive airflows and optional billet gearcases. For 900+ hp builds.

Labor Costs

  • Supercharger Removal and Installation: $800 – $1,800. Labor rates vary from $100 to $200 per hour; expect 6–10 hours for a typical swap.
  • Additional Labor for Supporting Mods: $200 – $500 per add-on (fuel pump, injectors, etc.).
  • Dyno Tuning (Custom Calibration): $500 – $1,500. A proper tune is mandatory for safety and performance. A reputable tuner like SRT Autoworks or Curt at SoCal Tuning will spend several hours on the dyno.

Supporting Modifications (Essential for 750+ HP)

  • High-Flow Fuel Injectors: $400 – $800. Injectors from FID or Injector Dynamics are common.
  • Dual In-Tank Fuel Pumps or Boost-A-Pump: $800 – $1,500. Fore Innovations or JG Modular offer solutions.
  • Cold Air Intake: $300 – $600. RotoFab or AFE cold air intakes improve airflow.
  • Upgraded Heat Exchanger (Intercooler System): $700 – $1,500. A larger, more efficient heat exchanger is critical for consistent power on the street.
  • Exhaust System (Headers + Cat-Back): $1,200 – $2,500. American Racing or Kooks headers reduce restriction and help spool.
  • Drivetrain Upgrades (Clutch, Driveshaft, Axles): $1,500 – $3,000. Mandatory for manual cars; automatics may require a torque converter.

Total Estimated Investment for 750+ HP: The sweet spot for a reliable, daily-drivable 750+ wheel horsepower Hellcat typically falls between $8,000 and $15,000, depending on the supercharger choice and how many supporting mods you need. A cheaper port-and-pulley setup with basic fueling can be done for around $5,000, but it will be at the lower end of the power range.

Factors That Influence the Total Investment

Not every build costs the same. Several variables can push the final price up or down by thousands of dollars.

Brand and Quality

A Whipple 2.9L kit costs more upfront than a budget off-brand, but it comes with proven engineering, better intercooler designs, and often yields higher horsepower per dollar. Cheap superchargers may save money initially but can cause reliability issues or require expensive repairs later. Always buy from reputable manufacturers. For example, Whipple Superchargers and Magnuson are industry leaders for a reason.

Vehicle Condition & Existing Modifications

If your Hellcat already has an intake, exhaust, and larger injectors from a previous owner, you save on those costs. Conversely, a completely stock car will need a complete suite of supporting mods. High-mileage engines may require a compression check and possibly a cam or valvetrain upgrade if you’re aiming above 800 hp.

Labor Rates in Your Area

High-performance shops in metropolitan areas charge $150–$200 per hour, while rural shops may be $100 or less. Also, some shops offer package deals if you buy the kit and have them install and tune it. Always ask for a bundled quote.

Warranty Considerations

Modifying the supercharger voids the factory powertrain warranty. Some aftermarket companies offer limited warranties on their superchargers, but the cost of those warranties is typically folded into the price. Factor in the risk—if the engine fails, you’re paying out of pocket. This is often why enthusiasts opt for lower-cost ported upgrades to preserve some factory reliability while staying under 750 hp.

Performance Expectations: What You Get for Your Money

Reaching 750+ wheel horsepower is a significant jump from the stock 650–680 whp (factory rating is at the crank, not wheels). Here is what real-world dyno results show for common builds.

Ported Stock Supercharger with Pulley (93 Octane)

  • Wheel Horsepower: 670 – 715 whp (roughly 770–820 crank hp)
  • Wheel Torque: 660 – 700 lb-ft
  • Quarter-Mile: 10.2 – 10.6 seconds @ 130–135 mph
  • Drivability: Daily drivable, minimal heat soak issues with a good heat exchanger.

Aftermarket 2.9L–3.0L Kit (93 Octane)

  • Wheel Horsepower: 720 – 780 whp (830–900 crank hp)
  • Wheel Torque: 700 – 750 lb-ft
  • Quarter-Mile: 9.8 – 10.3 seconds @ 135–140 mph
  • Drivability: Excellent street manners; may require sticky tires to put power down.

Aftermarket 3.2L–3.6L Kit with E85 Fuel System

  • Wheel Horsepower: 800 – 880 whp (920–1,000+ crank hp)
  • Wheel Torque: 780 – 850 lb-ft
  • Quarter-Mile: 9.2 – 9.8 seconds @ 140–150 mph
  • Drivability: Requires upgraded drivetrain and excellent cooling; not ideal for daily traffic due to fuel system complexity.

For most owners, the 750+ hp target is best met with a mid-range aftermarket kit (2.9–3.0L) combined with a proper fuel system and cooling. This configuration offers the best balance of cost, reliability, and thrill.

Beyond the Supercharger: Essential Supporting Mods

It is a common mistake to install a larger supercharger without addressing the supporting systems. The engine will demand more fuel, a cooler intake charge, and stronger driveline components. Overlooking these can lead to detonation, heat soak, or broken parts.

Fuel System

The stock fuel pumps and injectors are adequate for roughly 700 whp on pump gas. Beyond that, you need larger injectors and either a boost-a-pump or a full return-style fuel system. On E85, fuel flow requirements increase by 30–40%, so uprating the fuel lines and pumps is mandatory. Budget at least $1,000–$2,500 for a reliable fuel system.

Cooling System

The Hellcat’s intercooler is air-to-water, and the factory heat exchanger is small. Upgrading to a thicker, more efficient heat exchanger (e.g., from Afco or Mishimoto) is essential for consistent power on hot days. A larger reservoir and auxiliary pump can also help. Expect to spend $800–$1,500.

Exhaust

While not strictly required, a freer-flowing exhaust (headers and cat-back) reduces backpressure and allows the supercharger to spool more efficiently. Gains of 20–30 hp are common. Headers are the most impactful. Cost: $1,200–$2,500 installed.

Drivetrain

An automatic Hellcat can handle 750 whp with a torque converter upgrade (about $800) and perhaps a driveshaft loop. A manual car will need a stronger clutch (McLeod or Centerforce, $1,000–$2,000) and possibly upgraded axles. Ignoring the drivetrain invites broken half-shafts on hard launches.

Is 750+ HP Worth It?

For an enthusiast who cherishes throttle response, the sound of a whining supercharger, and the ability to outrun almost anything on the street, the cost of upgrading a Hellcat supercharger to 750+ hp is more than justified. The car transforms from a muscle car into a supercar slayer, with acceleration that rivals exotics costing ten times as much.

However, the investment goes beyond dollars. Maintenance costs increase—tires wear faster, fuel consumption rises, and the need for high-octane fuel or E85 adds ongoing expense. Reliability also depends on the quality of the parts and the skill of the tuner. A poorly executed build will be a headache; a properly engineered one will bring years of smiles.

Before you start, research local tuners with proven Hellcat experience. Read build threads on forums like Hellcat.org or LXForums to see real-world results. And be honest about your goals: do you want a daily driver that surprises people at the drag strip, or a track-dominating race car? The answer will guide your budget and component selection.

Ultimately, upgrading your 6.2 Hellcat supercharger to 750+ hp is a deeply rewarding endeavor for those who appreciate engineering and speed. The cost breakdown above provides a roadmap—now it’s up to you to decide how far you want to go.

Sources and further reading: Hellcat.org porting thread, Whipple Superchargers product page.