Understanding the ProCharger Stage 2 Kit

The ProCharger Stage 2 Kit is a complete centrifugal supercharger system engineered for the General Motors 3800 Series II and III V6 engines. Unlike positive-displacement blowers that deliver instant low-end boost, the ProCharger uses a belt-driven impeller that spins faster as engine RPM rises, producing linear, building boost pressure that extends well past the stock power peak. The Stage 2 designation typically includes a larger intercooler, high-flow discharge piping, and a tuner-friendly fuel system upgrade compared to the base Stage 1 kit.

Centrifugal superchargers are often favored for their efficiency and thermal characteristics. The ProCharger’s self-contained oiling system eliminates the need to tap into the engine’s oil supply, simplifying installation and reducing maintenance. For the 3800 platform, which was originally designed as a naturally aspirated workhorse, adding forced induction unlocks significant headroom—but only if the supporting systems are properly matched.

Real Performance Gains: Beyond the 3800 Claim

The phrase “3800 performance gains” is often misunderstood. It does not mean the engine produces 3,800 horsepower. Rather, it refers to the 3800 series engine family (3.8L V6). The ProCharger Stage 2 Kit is typically rated to add approximately 120–150 rear-wheel horsepower on a stock 3800 engine running conservative boost levels (around 8–10 psi). With proper tuning and supporting modifications, gains of 200+ whp are possible, pushing output well over 400 hp at the wheels—a dramatic increase from the stock 200–240 hp range.

Dyno-Proven Results

Independent dyno tests on 3800-powered vehicles (such as the Pontiac Grand Prix GTP, Buick Regal GS, and Chevrolet Monte Carlo SS) have shown the Stage 2 kit delivering 60–80 lb-ft of torque gains across the midrange, with peak horsepower gains occurring above 5,000 rpm. For example, a 2004 Grand Prix GTP with a stock bottom end and the Stage 2 kit, plus a custom tune and 3.4-inch pulley, recorded 329 whp and 368 lb-ft—about a 55% increase over the factory 210 whp. These numbers demonstrate that the $3,500 investment can transform a daily driver into a legitimate street performer.

Real-World Driving Feel

Because boost builds progressively, the ProCharger Stage 2 kit does not feel like a sudden “kick in the back” like a turbocharged setup. Instead, the acceleration becomes more linear and pulls harder as the tach swings past 3,500 rpm. This characteristic makes it easier to manage traction in front-wheel-drive cars, which are common on the 3800 platform. Enthusiasts report that the car feels “awake” above 4,000 rpm, with a sustained pull all the way to the 6,200 rpm redline.

Cost-Benefit Analysis: Breaking Down the $3,500

At $3,500, the ProCharger Stage 2 kit might appear to be a straightforward purchase, but the total cost of ownership includes several often-overlooked expenses. Let’s examine the true investment required to see that 3800 performance gain reliably.

Initial Kit Cost vs. Supporting Mods

  • ProCharger Stage 2 Kit: ~$3,500 (includes supercharger head unit, intercooler, brackets, belts, injectors, and tune)
  • Fuel system upgrades: A 3800 running 8+ psi needs larger injectors (e.g., 42 lb/hr or 60 lb/hr) and often a higher-flow fuel pump. Budget $300–$600.
  • Tuning: The kit may include a basic “canned” tune, but a custom dyno tune from a reputable shop costs $400–$700 and is strongly recommended for safety and power.
  • Installation labor: Professional installation typically runs $800–$1,200, depending on the shop rate and vehicle condition.
  • Maintenance: Centrifugal superchargers require periodic oil changes (head unit oil) every 20,000 miles—minor cost but should be factored.

Total realistic investment: $5,000–$6,000 for a fully supported, reliable setup. The raw kit price is only part of the picture.

Long-Term Value and Resale

A well-installed ProCharger Stage 2 kit can increase a vehicle’s resale value by $2,000–$3,000, especially if the car is sold to an enthusiast who understands the modification. However, many buyers prefer stock vehicles, so the return is not guaranteed. The real value lies in driving enjoyment and the ability to hang with much more expensive performance cars. A 3800 car with 400 whp can embarrass many modern V8s in a straight line, costing a fraction of the price.

Installation and Compatibility Considerations

Installing the ProCharger Stage 2 kit requires mechanical competence and specific tools. Here are the key factors every buyer should evaluate before pulling the trigger.

Vehicle-Specific Fitments

ProCharger offers Stage 2 kits for specific 3800 models. The kit for a 1997–2003 GTP/Regal GS is different from the kit for a 2004+ supercharged or naturally aspirated 3800. Always confirm the correct kit number against your vehicle’s engine code (L67, L32, L36, L26). The intercooler placement and bracket geometry vary.

Required Tools and Skill Level

  • Socket and wrench set, torque wrench, Allen keys, and a pulley puller
  • Access to a lift or jack stands (vehicle must be raised for under-car piping)
  • Basic wiring skills for the boost-a-pump or fuel pump controller
  • Patience for bleeding the cooling system and checking for leaks

Most DIYers with moderate experience can complete the install over a weekend, but first-timers should budget 12–16 hours. Professional installation is recommended if you are not comfortable with automotive electrical or boost-tuning systems.

Supporting Modifications That Strongly Affect Results

The 3800 engine has a cast iron block and forged crankshaft, making it quite robust. However, the stock connecting rods become a weak point above 450 whp. For Stage 2 power levels (350–400 whp), the bottom end is fine, but you should consider upgrading the exhaust system (downpipe and cat-back) and adding a larger heat exchanger for the intercooler to prevent heat soak during repeated pulls. A 3-inch cat-back exhaust and a ported supercharger throttle body can yield an extra 15–25 whp.

Comparing the ProCharger Stage 2 to Alternatives

The $3,500 price tag places the ProCharger Stage 2 in the mid-range of forced induction upgrades for the 3800. How does it stack up against other options?

Turbocharger Kits

A complete turbo kit for a 3800 (e.g., CX Racing or custom setups) can cost $2,800–$5,000, depending on turbo size and quality. Turbos can produce more peak power with better efficiency, but they require extensive oil and coolant lines, more complex tuning, and often suffer from lag on small-displacement engines. The ProCharger offers simpler installation and more predictable boost characteristics for street driving.

Positive Displacement Superchargers (Eaton M90/M112)

The 3800 GTPs already came from the factory with an Eaton M90 roots-type supercharger. Aftermarket high-performance versions (e.g., Gen V, M112 swap) can be cheaper ($1,500–$2,500) but produce more heat and parasitic loss at high RPM. The ProCharger’s centrifugal design is cooler and more efficient at high boost, making it superior for sustained high-RPM power. However, low-end torque is less than a PD blower.

Nitrous Oxide

A wet nitrous kit costs $500–$1,000 and can temporarily add 100+ hp. But nitrous requires bottle refills ($4–$6 per pound), and inconsistent jetting can lead to engine damage. For a daily driver wanting reliable, on-demand power, the ProCharger is a far better long-term solution.

Common Myths and Misconceptions

Several myths surround the ProCharger Stage 2 kit on the 3800. Let’s clear them up.

  • “It will blow up my engine immediately.” Not if properly tuned and kept to safe boost levels (under 12 psi on stock internals). Thousands of 3800s run ProChargers reliably for 50,000+ miles.
  • “The intercooler is too small.” The Stage 2 intercooler is air-to-air and sized for 350–400 whp. For higher outputs, upgrading to a larger core is wise.
  • “I can reuse my stock fuel injectors.” Wrong. The Stage 2 kit includes larger injectors, but if you buy a used kit without them, you must install 42 lb/hr injectors or larger.
  • “No tune is needed.” The kit comes with a handheld tuner or preloaded file, but that tune is generic. Custom tuning is strongly recommended for optimal power and safety.

External Resources for Further Research

Before purchasing, consult these authoritative sources to make an informed decision:

Conclusion: Is the ProCharger Stage 2 Kit Worth It?

For the enthusiast who wants to transform a mundane 3800 daily driver into a legitimate street performer, the ProCharger Stage 2 kit represents one of the best horsepower-per-dollar values available. The upfront cost of $3,500—combined with necessary supporting mods and installation—totals around $5,000–$6,000, delivering a reliable 350–400 whp that can be enjoyed every day. The linear power delivery, ease of maintenance, and robust head unit design make it a compelling choice.

However, it is not for everyone. If you are on a strict budget, lack mechanical skills, or want instant low-end torque for drag racing, a turbo or positive displacement supercharger may suit you better. The ProCharger Stage 2 is ideal for the driver seeking high-RPM big power on the street or highway, with the option to upgrade further later (e.g., Stage 3 with a larger pulley and intercooler).

Ultimately, the value of the $3,500 investment depends on your goals. If 3800 performance gains mean turning a sensible sedan or coupe into a sleeper that can hang with modern V8s, then yes—the ProCharger Stage 2 is absolutely worth it.