The Jeep Grand Cherokee SRT is already a formidable performance SUV, packing a 6.4L Hemi V8 that delivers 475 horsepower from the factory. But for enthusiasts who crave even more—enough to embarrass sports cars or dominate the drag strip—the goal of 700+ horsepower is both realistic and electrifying. Achieving this level of power requires forced induction: a supercharger or turbocharger system that forces extra air into the engine. This comprehensive guide breaks down every cost, component, and consideration involved in turning your Grand Cherokee SRT into a true 700+ hp beast. We’ll cover parts, labor, tuning, and the ongoing realities of owning a high-performance forced induction vehicle.

Understanding Forced Induction

Forced induction works by compressing the air entering the engine, allowing it to burn more fuel and produce significantly more power than a naturally aspirated engine of the same displacement. The two primary methods—superchargers and turbochargers—each have distinct characteristics that affect both the driving experience and the budget.

Superchargers vs. Turbochargers

A supercharger is belt-driven directly off the engine’s crankshaft, providing immediate boost and throttle response. It feels linear and predictable, making it a favorite for daily-driven SUVs where instant power is desired. Common choices for the Grand Cherokee SRT include centrifugal superchargers (like a Vortech or Procharger) and twin-screw units (like a Whipple or Eaton). Centrifugal setups are generally more affordable and easier to install, while twin-screw designs produce massive low-end torque.

Turbochargers, on the other hand, are exhaust-driven. They spool up as exhaust flow increases, delivering a more dramatic power curve that peaks at higher RPMs. While turbos can achieve higher peak horsepower numbers, they require more complex plumbing (hot and cold side piping, wastegates, blow-off valves) and often need custom fabrication for the Grand Cherokee’s engine bay. The trade-off is the potential for 800+ hp with the right turbo setup, but at greater cost and complexity.

For most SRT owners targeting 700+ hp, a centrifugal supercharger kit offers the best balance of cost, reliability, and street manners. Turbo setups are better suited to track-focused builds or those willing to invest significantly more time and money.

Key Components for 700+ HP

Achieving 700+ horsepower is not as simple as bolting on a blower. Several supporting systems must be upgraded to handle the additional air and fuel. Here’s a breakdown of each critical component.

Forced Induction Kit

The heart of the build. For the Grand Cherokee SRT, reputable supercharger kits from companies like Hennessey Performance, ProCharger, or Whipple are common choices. A quality kit includes the supercharger unit, intake piping, intercooler, belt drive, and necessary brackets. Pricing ranges from $6,000 to $10,000 depending on brand and included features. Turbo kits, often custom-fabricated, can run $8,000 to $15,000.

Upgraded Fuel Injectors

Factory injectors are insufficient for 700+ hp. You’ll need larger injectors—typically 1000 cc/min or higher—to deliver the fuel volume required. Expect to spend $500–$1,200 for a set of eight high-impedance injectors.

High-Performance Fuel Pump

Fuel pressure and flow must keep up. A drop-in replacement pump, like a Walbro 525 or a dual-pump setup, is necessary. Cost: $300–$800. In some cases, a return-style fuel system with an external regulator may be needed, adding $200–$400.

Intercooler System

Compressing air generates heat, which reduces power and can cause detonation. An air-to-air or air-to-water intercooler keeps intake temperatures in check. Most supercharger kits include an intercooler, but upgrading to a larger unit may be needed for sustained high-speed runs. Budget $1,000–$2,500 for a quality intercooler setup.

Upgraded Exhaust System

To let the engine breathe, a free-flowing exhaust is essential. A full 3-inch exhaust system with headers (long-tube or shorty) and high-flow catalytic converters will reduce backpressure. Headers alone can cost $1,200–$2,000; a cat-back system adds $800–$1,500. Total exhaust expenditure: $1,000–$2,000 if you reuse some factory pieces, but $2,000–$3,500 for a complete system.

Engine Management and Tuning

Forced induction requires recalibrating the ECU. Options include a handheld tuner (HP Tuners, DiabloSport) for DIY tuning, or a custom tune from a shop. A custom dyno tune is highly recommended for safety and performance. Hardware (tuning device) costs $500–$800; professional tuning labor is $500–$1,200. Total: $1,500–$3,000.

Additional Cooling Components

Power generates heat. An upgraded radiator, transmission cooler, and oil cooler may be necessary, especially in warmer climates or for track use. Budget $500–$1,500 for additional cooling.

Cost Breakdown (Detailed)

The following list provides a realistic range for each major category. Prices are based on current market averages for Jeep SRT forced induction builds.

  • Forced Induction Kit (Supercharger or Turbo): $6,000 – $10,000
  • Upgraded Fuel Injectors (1000cc+): $500 – $1,200
  • High-Performance Fuel Pump: $300 – $800
  • Return-Style Fuel System (if needed): $200 – $600
  • Intercooler System: $1,000 – $2,500
  • Exhaust System (Headers + Cat-back): $1,500 – $3,000
  • Engine Management (Tuner + Custom Tune): $1,500 – $3,000
  • Additional Cooling (Radiator, Oil Cooler, Trans Cooler): $500 – $1,500
  • Miscellaneous (Gaskets, fluids, clamps, belts): $200 – $500

Total Parts Cost: $11,700 – $22,100

Labor and Installation Costs

Professional installation is strongly advised for a forced induction system on a Grand Cherokee SRT. The complexity of routing intercooler piping, modifying the exhaust, and ensuring all cooling systems work together requires a skilled shop. Labor rates vary: $100–$200 per hour is typical. A full installation can take 20–40 hours, depending on the kit’s completeness and any custom fabrication needed.

  • Supercharger kit installation: 20–30 hours → $2,000 – $6,000
  • Turbo kit installation (often more custom): 40–60 hours → $4,000 – $12,000

For a supercharger build, budget $2,000–$4,000 in labor. For a turbo build, $4,000–$8,000 is more realistic. Some shops offer package deals that include tuning.

Total Estimated Cost

Adding parts and labor, the total investment for a reliable 700+ hp Grand Cherokee SRT with forced induction generally falls between $14,000 and $26,000. This estimate assumes a supercharger setup, which is the most common route. A high-end turbo build with all supporting mods and professional fabrication could exceed $35,000.

Additional Considerations

Before committing, consider these critical factors that will affect both your wallet and your ownership experience.

Warranty Implications

Adding forced induction almost certainly voids the engine and drivetrain warranty. Some aftermarket companies offer limited warranties on their kits, but the OEM warranty will be voided. If your SRT is still under factory warranty, factor in that cost.

Insurance Costs

Notify your insurance company of the power increase. Many insurers will increase premiums for modified vehicles. Some specialty insurers (like Hagerty or Grundy) provide agreed-value policies for modified cars, but premiums will be higher.

Reliability and Longevity

A 700+ hp forced induction engine places higher stress on pistons, rods, bearings, and the transmission. The 8-speed automatic (ZF 8HP70 or 8HP95) in newer Grand Cherokees is stout, but at 700+ hp, it may require a torque converter upgrade or valve body modification. Budget $1,500–$3,000 for transmission upgrades if you plan to drag race or do repeated hard launches.

Fuel Requirements

For 700+ hp on pump gas, you’ll need 93 octane (or higher). In areas where only 91 octane is available, you may need to run a lower boost level or mix in race fuel/E85. E85 conversion can add $500–$1,500 for fuel system modifications but can provide extra safety margin.

Performance Expectations and Dyno Results

With a properly tuned centrifugal supercharger on 93 octane, a Grand Cherokee SRT can produce 650–700 whp (wheel horsepower), which translates to roughly 750–800 hp at the crank. A twin-screw supercharger may achieve similar numbers with more low-end torque. Turbocharged setups can exceed 800 whp with a built engine, but 700 whp is common on a stock bottom end with conservative tuning.

On a chassis dyno, expect 600–650 whp from a 700+ crank hp setup. Quarter-mile times typically drop into the 11.2–11.8 second range with proper traction, compared to the stock 12.5–13.0 seconds. Trap speeds often exceed 120 mph.

Ongoing Maintenance and Reliability

High-performance builds demand more frequent maintenance:

  • Oil changes every 3,000–5,000 miles with high-quality synthetic (0W-40 or 5W-50).
  • Spark plugs every 15,000–20,000 miles (one or two steps colder).
  • Check supercharger belt and tensioner for wear annually.
  • Inspect intercooler system for leaks or debris.
  • Monitor fuel trims and air/fuel ratios with a wideband gauge.

Reliability can be excellent if the tune is conservative and maintenance is diligent. Many owners log 50,000+ trouble-free miles on 700 hp supercharger builds.

Alternatives to Forced Induction

If the cost of forced induction is prohibitive, consider these alternatives, though they won’t match 700+ hp:

  • Nitrous Oxide: A 150–200 shot can push power to 600–650 hp for under $2,000 (including installation and tuning). However, nitrous must be refilled and carries risks of detonation if not tuned perfectly.
  • Built Naturally Aspirated Engine: Ported heads, camshaft, intake, and exhaust can yield 550–600 hp with a cost of $5,000–$10,000. This retains factory reliability but falls short of 700 hp.
  • E85 Tune (Stock Engine): A flex-fuel tune on the stock 6.4L can add 20–30 hp and reduce knock risk, but will not approach 700 hp. Cost: $500–$1,000.

Conclusion

Upgrading your Grand Cherokee SRT to 700+ horsepower with forced induction is a serious financial commitment and mechanical undertaking. The typical budget of $14,000 to $26,000 buys a well-executed supercharger system with all supporting modifications and professional installation. The result is an SUV that accelerates like a supercar while retaining its everyday utility. By carefully selecting components, budgeting for labor and maintenance, and understanding the trade-offs, you can transform your SRT into a reliable high-performance machine. Whether you choose a centrifugal blower for instant response or a turbo for peak power, the journey demands careful planning but rewards with an unforgettable driving experience.

For further reading, check out build threads on JeepGarage.org and performance parts from HemiFever.