engine-modifications
Cost Breakdown: Installing a 9 Psi Flyin' Miata Supercharger and Achieving 220+ Hp
Table of Contents
Overview of the Flyin' Miata Supercharger Upgrade
The Flyin' Miata (FM) supercharger kit is one of the most well-engineered forced induction solutions for the Mazda MX-5 Miata. Designed to deliver a reliable 220+ horsepower at a modest 9 psi of boost, this kit transforms the Miata from a peppy roadster into a genuinely quick sports car. While the stock 1.8L engine produces around 140 horsepower, adding a supercharger effectively increases specific output without requiring a full engine rebuild. This article provides an exhaustive cost breakdown—from the initial kit purchase through installation, tuning, and necessary supporting modifications—so you can budget realistically for the project.
The total investment for a 9 psi Flyin' Miata supercharger installation typically lands between $6,500 and $8,500, depending on labor rates, local taxes, and optional upgrades. But the real value comes from the transformative driving experience: instant throttle response, a linear powerband, and the ability to outrun many modern sport compacts.
Why the Flyin' Miata Supercharger?
Before diving into costs, it’s worth understanding what makes this kit a favorite among Miata enthusiasts. Unlike turbochargers that can introduce lag and complex plumbing, the Eaton TVS series supercharger used by FM provides boost almost instantly. The kit is CARB-compliant in many configurations, meaning it can pass emissions testing in California when paired with the included ECU tune. Flyin' Miata also offers exceptional customer support and comprehensive installation documentation.
Several factors contribute to the kit’s reputation:
- Purpose-built design: Every bracket, pulley, and hose is engineered specifically for the Miata chassis.
- Upgrade path: The 9 psi base setup can later be upgraded with a smaller pulley for 12-14 psi, or a larger intercooler for sustained track use.
- Proven reliability: Thousands of installations across Miatas from 1990-2005 (NA, NB) have shown consistent results with proper tuning.
If you’re serious about boosting your Miata, the FM supercharger kit is widely considered the gold standard for street-driven cars.
Base Supercharger Kit Cost
The heart of the project is the supercharger kit itself. As of 2025, the Flyin' Miata 9 psi supercharger kit (often referred to as the "Voodoo II" or "Little Enchilada" depending on included extras) costs $4,500. This price includes the Eaton TVS 900 supercharger unit, cast aluminum intake manifold, drive belt, tensioner system, fuel injectors (usually 550cc or 600cc), and a piggyback ECU controller (Voodoo Box) or a full replacement ECU option.
It’s important to note that the kit does not include an intercooler at the 9 psi level, relying instead on water/methanol injection or just the thermal efficiency of the Eaton unit. However, many owners choose to add an intercooler later (see Additional Costs below).
Special order options, like the CARB-compliant version with additional emissions hardware, may add $200-$500. Always check current pricing directly from Flyin' Miata.
Installation Labor Costs
Professional installation of a supercharger requires significant mechanical skill. While a home mechanic can tackle the job in a weekend, the average shop charges an hourly rate of $100-$150. The FM kit takes approximately 10 to 15 hours for a competent shop, so labor typically runs $800 to $1,500.
Factors that influence labor time:
- If you request an intercooler install simultaneously, add 2-4 hours.
- Older Miatas may have rusted bolts or aged hoses that need replacement, adding time.
- Accessory items like water/methanol injection require extra labor.
To save money, some enthusiasts opt to install the kit themselves. Flyin' Miata provides detailed written instructions and video tutorials. If you have basic tools, a torque wrench, and a friend to help, you can complete the install over a weekend, paying only for a shop to do final tuning.
Tuning Services
After mechanical installation, proper engine calibration is critical. A stock Miata ECU cannot compensate for the increased airflow and fuel demand without a tune. The Flyin' Miata kit includes a Voodoo Box piggyback controller that modifies injector pulse width and ignition timing, but the base tune may not be optimal for every car.
Professional dyno tuning typically costs $400 to $800. A good tuner will adjust fuel maps, ignition timing, and check for knock at all rpm ranges. Remote tuning services are also available, though you must have a wideband oxygen sensor and datalogging capability.
For full control and better drivability, many owners upgrade to a standalone ECU like the Megasquirt 2 or 3. That adds $600-$1,200 to the budget but provides precise control and the ability to later increase boost.
Miscellaneous Parts and Supplies
Even with a comprehensive kit, you will need consumables and small parts. Budget an extra $300 for these items:
- Coolant, oil, and transmission fluid
- New spark plugs (one step colder recommended)
- Hose clamps, vacuum lines, electrical connectors
- Thread locker, gasket maker, and cleaning solvents
- Optional: boost gauge and air/fuel ratio gauge ($150-$300)
If your Miata has high mileage, consider replacing the clutch and water pump while the supercharger is installed. A stronger clutch (Fidanza, ACT) costs $300-$500, and water pump replacement is another $100 in parts. These preventative upgrades can save you from future downtime.
Taxes and Fees
Sales tax on the $4,500 kit depends on your location, averaging 7-10% ($315-$450). Shipping is usually included in the kit price, but if not, add $50-$100. Some states charge fees for emissions testing after modifications, or for obtaining a new title with a modified engine. Budget $400 total for taxes and registration-related costs.
Potential Additional Costs: Supporting Upgrades
To reliably achieve 220+ horsepower and maintain safety margins, many Miata owners invest in supporting modifications. These are not strictly required for the base kit, but they significantly improve longevity and performance.
Upgraded Fuel System
The stock Miata fuel pump can handle 9 psi at 220 horsepower, but it’s near its limit. A high-flow in-tank pump (Deatschwerks, Walbro 255) costs about $150-$250. Combined with an adjustable fuel pressure regulator ($100), total fuel system upgrade cost is $500 including fittings and lines.
Intercooler Upgrade
At 9 psi, the FM kit uses a water-to-air charge cooler (similar to an intercooler but liquid cooled). The standard unit works well for street driving. However, for sustained boost on track, an air-to-air intercooler kit from Track Dog Racing or FM themselves costs $700-$1,200 and will reduce intake air temperatures by 30-50°F. The intercooler upgrade also frees up future boost upgrades.
Performance Exhaust
To let the engine breathe, a less restrictive exhaust system is recommended. A full cat-back system from Racing Beat, FM, or RoadsterSport costs $300-$600. If you also replace the downpipe and catalytic converter (midpipe), add another $400-$700. Total for a complete 2.5-inch or 3-inch exhaust: $1,000.
Clutch and Flywheel
Stock clutches begin to slip around 200 horsepower. An upgraded clutch (ACT HD, Exedy Stage 1) and lightweight flywheel will cost $400-$700 plus installation labor ($300). This is highly recommended for automatic reliability.
Cooling System Enhancements
Higher power generates more heat. A larger aluminum radiator (Koyo, Mishimoto) costs $200-$400, and a thermostat with a lower opening temperature ($20) helps. A ducted air intake (cold air box) can also improve performance.
Long-Term Maintenance and Operating Costs
Supercharged Miatas require more frequent maintenance. Plan for:
- Oil changes every 3,000-5,000 miles with high-quality synthetic (5W-30 or 10W-40).
- Supercharger oil inspection every 10,000 miles (Eaton specific fluid).
- Spark plugs every 15,000-20,000 miles (due to increased heat).
- Belt replacement every 30,000 miles (the supercharger belt wears faster).
- Clutch life may be 30,000-50,000 miles with aggressive driving.
Additionally, you may see a 10-15% reduction in fuel economy when driving spiritedly. Budget an extra $200 per year for consumables beyond normal Miata maintenance.
Comparison with Turbocharger Alternatives
For the same budget as a supercharger (around $7,500), you could install a turbo system producing similar or more horsepower. Common options include the Kraken, Artech, or Flyin' Miata’s own turbo kits. Here are key differences:
| Aspect | Supercharger (FM 9 psi) | Turbocharger (e.g., FM GT2554) |
|---|---|---|
| Peak horsepower | 220-230 whp | 200-260 whp (depending on turbo) |
| Power delivery | Linear, instant response | Laggier spool, strong rush |
| Installation complexity | Moderate, no oil lines | Higher, requires oil supply and drain |
| Heat management | Less heat under hood | More heat, potential for heat soak |
| Cost similar | ~$7,500 complete | ~$7,000-8,500 |
| Drivability for daily | Excellent | Good if properly tuned |
Choosing between them depends on your driving preferences. The supercharger offers seamless power for street and autox, while a turbo may suit track days and drag racing better.
Real-World Installation Challenges and Tips
Installing a supercharger is not without potential headaches. Here are common pitfalls to budget for:
- Vacuum leaks: Ensure all silicone couplers are tight and you have enough hose clamps. A smoke test can save time.
- Fuel pressure issues: The supplied Voodoo Box relies on a boost-sensitive fuel pressure regulator. If you have a return-style fuel system, ensure the regulator is calibrated.
- Belt alignment: The supercharger bracket must be perfectly aligned; use a straightedge. Slight misalignment causes belt squeal and premature wear.
- ECU troubles: Some older Miatas with aftermarket immobilizers may conflict with the Voodoo Box. Be prepared to bypass or reprogram.
If you’re not experienced, hiring a shop that specializes in Miatas (like Flyin' Miata or local performance shops listed on Miata.net) is strongly recommended. They will have the correct tools and knowledge.
Total Estimated Investment
Here is a consolidated table of all costs discussed:
| Expense | Low Estimate | High Estimate |
|---|---|---|
| Flyin' Miata Supercharger Kit | $4,500 | $4,500 |
| Installation Labor (if hired) | $800 | $1,500 |
| Tuning (dyno or remote) | $400 | $800 |
| Miscellaneous Parts & Fluids | $300 | $500 |
| Taxes & Fees | $400 | $500 |
| Fuel Pump Upgrade | optional $250 | $500 |
| Intercooler Upgrade | optional $700 | $1,200 |
| Exhaust Upgrade | optional $600 | $1,000 |
| Clutch Upgrade + install | optional $700 | $1,200 |
| Total (with all options) | $8,650 | $11,700 |
If you stick to the bare essentials (kit, labor, tune, fluids, tax), you can expect to invest about $6,600. Adding an intercooler, fuel system, and exhaust pushes the total toward $8,500. With clutch and full supporting mods, budget up to $10,000.
Is It Worth It?
For Miata enthusiasts seeking an exhilarating driving experience, the 9 psi Flyin' Miata supercharger offers one of the best power-per-dollar improvements available. The linear power delivery transforms the car without ruining its character. Crucially, the kit retains reliability if you use quality parts and proper tuning.
Compare this to the cost of a different car: you could buy a used Mazdaspeed Miata (MSM) for $8,000-$12,000, but you’d still likely want to upgrade its suspension and intercooler. Alternatively, building your own NB with a supercharger gives you a modernized, reliable boost with known results.
Before committing, join communities like Miata.net Forum and read build threads. You can also find used Flyin' Miata supercharger kits for $2,500-$3,500 if you’re patient, but be wary of missing parts or worn units.
Final Budgeting Advice
To avoid financial surprises, follow these steps:
- Price the exact kit you want from Flyin' Miata (including shipping).
- Get at least three labor quotes from shops familiar with Miatas.
- Set aside 15% of the kit cost for unforeseen parts or issues.
- Decide which supporting mods you need before purchase—it’s cheaper to install intercooler and clutch at the same time.
- Factor in insurance premium increases for modified vehicles (about $100-$200/year).
In conclusion, installing a 9 psi Flyin' Miata supercharger and achieving 220+ horsepower is a rewarding project that, with careful planning, can be completed within a reasonable budget. The result is a Miata that is faster, more responsive, and more fun to drive—without sacrificing daily usability.