The Dodge Challenger stands as one of the most iconic American muscle cars ever produced. When you combine its aggressive styling with a 5.7-liter HEMI V8 and then force-feed that engine via a Weiand supercharger, you get a street-legal monster that delivers neck-snapping acceleration and an unforgettable exhaust note. Targeting 550 wheel horsepower—a figure that puts you solidly in Corvette and high-end Mustang territory—requires careful planning, the right parts, and a realistic budget. This expanded guide breaks down every major cost area, from the donor car to the last dyno pull, so you can build your dream machine without financial surprises.

Choosing the Right Base Vehicle

The foundation of any build is the Challenger itself. Prices fluctuate wildly based on model year, mileage, transmission, and overall condition. Here is what you can expect to pay for a solid starting point:

Model Year Pricing

  • 2015–2020 Dodge Challenger (R/T with 5.7 HEMI): $25,000 – $40,000. These years offer the most value, with a proven engine platform and aftermarket support. Look for cars with the Super Track Pak or adaptive dampers if you plan to push hard on the street or track.
  • 2021–2023 Dodge Challenger (R/T): $40,000 – $60,000. Newer models include the updated Uconnect system and slightly improved suspension geometry. They tend to be cleaner and have lower miles, but the premium can stretch your budget.

Consider buying a car with the 6-speed manual transmission if you enjoy full control; the 8-speed automatic can handle more power but adds cost for a stronger torque converter. Avoid salvage-title cars unless you are a professional mechanic, as hidden frame damage can derail your build.

Engine Modifications: Building the Heart of 550 HP

The stock 5.7 HEMI produces around 375–385 horsepower at the crank, depending on the model year. To reach 550 HP at the wheels (roughly 650 crank HP), you must add forced induction and upgrade the fuel and air delivery systems.

Weiand Supercharger Kit ($5,000 – $7,000)

Weiand has been a trusted name in supercharging for decades. Their centrifugal supercharger kit for the 5.7 HEMI includes a polished blower, intake manifold, belt drive, intercooler, and all hardware. The kit itself is the single biggest expense, but it is also the key to your horsepower goal. Prices vary based on whether you buy new, used, or opt for a billet vs. cast impeller version.

High-Performance Fuel Injectors ($600 – $800)

Stock injectors will max out well before 550 WHP. You need injectors that flow at least 50 lb/hr (or 525 cc/min). Brands like DeatschWerks or Injector Dynamics offer plug-and-play options. Pay for a set that includes proper connectors and data sheets for tuning.

Upgraded Fuel Pump ($300 – $500)

With a supercharger demanding more volume and pressure, the stock in-tank fuel pump falls short. A 340 LPH (liters per hour) pump is the minimum; some builders run a dual-pump setup for safety. Budget for a wiring upgrade kit to handle the current.

Cold Air Intake System ($200 – $400)

The supercharger already needs all the cool, dense air it can get. A high-flow intake tube and cone filter replace the restrictive factory airbox. Look for a system with a heat shield to reduce inlet air temperatures. This is a minor expense that pays off in consistency.

Performance Exhaust System ($1,000 – $2,000)

To let the boosted HEMI breathe, you need headers (or at least high-flow cats) and a cat-back system. Borla and Corsa offer systems that reduce backpressure and add a deep, aggressive note. Long-tube headers can add another 20–30 HP but require a tune to clear emissions.

If your budget allows, upgrading the camshaft, valve springs, and pushrods will let the engine rev higher and make more power. This can add another $1,500–$2,500 but is not strictly necessary for 550 WHP on a conservative tune.

Supporting Modifications: Strength and Reliability

Power without supporting hardware leads to broken parts. You must upgrade the drivetrain, cooling, and electronics to handle the extra stress.

Heavy-Duty Transmission ($2,000 – $4,000)

The stock 5-speed automatic (if you have an older car) cannot survive 550 WHP. Even the 8-speed may slip if you abuse it. A built transmission with upgraded clutches, bands, and a higher stall torque converter is essential. If you prefer a manual, a McLeod RXT twin-disc clutch is a wise investment.

Upgraded Engine Management System ($500 – $1,500)

You need a custom tune to control the supercharger, fuel, and ignition timing. Many shops use HP Tuners or DiabloSport handheld programmers. Some owners opt for a standalone ECU like a Holley Dominator for ultimate control, but that adds complexity and cost.

Performance Radiator and Cooling ($300 – $600)

Forced induction generates immense heat. An aluminum, dual-pass radiator and a high-flow water pump keep coolant temperatures manageable. Consider an oil cooler as well—engine oil temperatures spike quickly under boost.

High-Performance Tires ($800 – $1,500)

550 WHP is useless if you cannot put it to the ground. Drag radials like Nitto NT555RII or Mickey Thompson ET Street S/S are crucial. Buy a set of wider rear wheels (10.5–11 inches) to mount them properly.

Suspension and Brakes ($1,000 – $2,500)

Stiffer springs, adjustable shocks, and larger brakes ensure the car stops and handles well. The stock brakes on the R/T are marginal for highway-speed stops when you are pushing an extra 200 HP. Upgraded pads and rotors are a minimum.

Labor Costs: Professional vs. DIY

If you are a skilled mechanic with a lift and a fully stocked toolbox, you can save thousands. Most enthusiasts either lack the tools or the confidence to install a supercharger and tune a modern engine. Here is what typical shops charge:

  • Supercharger and component installation: $1,500 – $3,000. This includes removing the intake manifold, adding the blower bracket, routing intercooler plumbing, and wiring.
  • Transmission and drivetrain work: $800 – $2,000 (if needed).
  • Tuning and dyno time: $500 – $1,000. Expect at least 6–8 pulls to dial in air/fuel ratios and ignition timing safely.
  • Miscellaneous labor (exhaust, cooling, suspension): $1,000 – $2,500.

Total labor estimate: $3,800 – $8,500 — a significant chunk of the build budget.

Miscellaneous Costs: The Hidden Expenses

No project ever goes exactly to plan. Set aside funds for the unexpected:

  • Tools and equipment: $200 – $500 (torque wrench, pulley puller, scan tool).
  • Fluids, filters, and belts: $100 – $300 (synthetic oil, coolant, intercooler fluid, high-tension belts).
  • Unexpected repairs: $500 – $1,500 (a leaky intake gasket, a cracked exhaust manifold, a failed water pump during teardown).

Total Cost Breakdown: The Bottom Line

Add everything together, and you get a clear picture. Remember that prices vary by region and vendor. Always get multiple quotes for labor and shop around for parts on sale.

  • Base vehicle: $25,000 – $60,000
  • Engine modifications (supercharger, fuel, intake, exhaust): $7,100 – $11,700
  • Supporting modifications (transmission, cooling, suspension, tires, management): $4,100 – $10,100
  • Labor: $3,800 – $8,500
  • Miscellaneous: $800 – $2,300
  • Estimated total: $40,800 – $92,600

These numbers represent a realistic range. A budget-conscious builder using a used car, doing all labor, and buying parts through forums can land near the low end ($40,000). A turnkey build with a new car, custom paint, and professional tuning easily crosses $90,000.

Performance Expectations and Real-World Driving

With 550 WHP and proper traction, your Challenger accelerates from 0–60 mph in the low 3-second range and runs the quarter-mile in the high 10s to low 11s. That is supercar territory. The supercharger whine and HEMI rumble turn heads everywhere.

However, higher power means higher maintenance. Expect to change oil every 3,000 miles, inspect the supercharger belt regularly, and run high-octane fuel (91 or 93) at all times. Track days will require cooling system checks and tire replacements sooner.

Final Thoughts: Is It Worth It?

Building a 550 HP Challenger with a Weiand supercharger is a rewarding project that yields a unique car far more exciting than the factory Hellcat. The cost can be high, but the satisfaction of building your own beast is unmatched. Plan your budget carefully, buy quality parts, and invest in a professional tune. Your wallet will feel the pinch, but every time you stomp the throttle, you will remember why you did it.