Understanding Mopar B‑body Vehicles

The Mopar B‑body platform, produced by Chrysler from the early 1960s through the late 1970s, is the foundation for some of the most iconic American muscle cars ever built. Models like the Dodge Charger, Plymouth Road Runner, Dodge Super Bee, and Plymouth Satellite all ride on this unibody chassis. These cars are prized for their aggressive styling, potent V‑8 engines, and solid aftermarket support. Upgrading a B‑body with performance parts not only sharpens its driving character but also adds real value to the car. This article breaks down the costs of common upgrades and provides practical installation advice so you can build the car you want without wasting money or time.

Common Performance Parts for Mopar B‑body

Before diving into costs, it helps to know the most popular upgrade categories. Each area affects performance differently, so you can prioritize based on your goals — whether that’s straight‑line acceleration, cornering grip, or a more aggressive exhaust note.

  • Engine upgrades – headers, intake manifolds, carburetors, camshafts, and ignition systems
  • Suspension improvements – shocks, springs, sway bars, control arms, and bushings
  • Exhaust systems – cat‑back setups, headers, mufflers, and tailpipes
  • Braking enhancements – performance pads, rotors, calipers, and stainless‑steel lines
  • Transmission modifications – shift kits, torque converters, gear sets, and auxiliary coolers
  • Drivetrain – differential gears (ring & pinion), limited‑slip units, and drive shafts

Cost Breakdown of Performance Parts

Prices vary by brand, material, and vehicle year. The ranges below reflect current market prices for high‑quality aftermarket parts (as of 2025). Labor costs are not included unless noted; professional installation adds roughly $75–$150 per hour depending on your region.

Engine Upgrades

  • Headers: $300 – $1,200. Mild‑steel versions run $300–$600; ceramic‑coated or stainless steel cost $600–$1,200. Long‑tube headers make the most power but may require modifications to the steering linkage on some B‑bodies.
  • Intake manifold: $200 – $700. Dual‑plane intakes (e.g., Edelbrock Performer) are $200–$400; single‑plane high‑rise (e.g., Victor Jr.) cost $400–$700.
  • Carburetor: $150 – $650. A basic Holley 600‑CFM starts around $150; a 850‑CFM race unit with billet fuel bowls can exceed $600.
  • Camshaft kit: $200 – $500. Includes cam, lifters, and springs. A mild street roller cam is ~$250; a solid‑roller race grind can hit $500.
  • Ignition system: $150 – $400. Upgraded distributor, coil, and wires (e.g., MSD or Petronix).

Suspension Improvements

  • Shocks: $100 – $400 per pair. Standard gas‑charged shocks are $100–$200; adjustable coilover shocks or remote‑reservoir units cost $300–$400 per pair.
  • Springs: $150 – $500 per pair. Stock‑height replacements from Moog are ~$150; lowering springs or variable‑rate coils run $250–$500.
  • Sway bars: $200 – $500. Factory bar replacement is $200–$300; aftermarket hollow or adjustable bars cost $350–$500.
  • Control arms & bushings: $200 – $600. Tubular control arms with polyurethane bushings start at $300; full front and rear sets can exceed $600.

Exhaust Systems

  • Cat‑back exhaust: $500 – $1,200. Mild‑steel systems with turbo mufflers are $500–$700; stainless steel with premium mufflers (e.g., MagnaFlow or Flowmaster) cost $800–$1,200.
  • Mufflers: $100 – $300 each. Standard turbo mufflers ~$100; stainless chambered mufflers ~$200; high‑flow race mufflers ~$300.
  • Headers (included above): $300 – $1,200.

Braking Enhancements

  • Performance brake pads: $100 – $250 per axle. Semi‑metallic pads are $100–$150; ceramic or carbon‑metallic pads $150–$250.
  • Rotors: $150 – $400 each. Standard slotted rotors $150–$250; drilled & slotted or two‑piece floating rotors $250–$400.
  • Aftermarket brake kit: $500 – $2,000. Common upgrades include 11.75″ rotors and dual‑piston calipers.

Transmission Modifications

  • Shift kit: $150 – $400. TransGo or similar kits for TorqueFlite 727/904. DIY installation possible; professional labor adds $200–$400.
  • Torque converter: $200 – $600. A 2,200–2,400 RPM stall converter for street use costs $200–$350; a high‑stall race converter (3,500+ RPM) runs $400–$600.
  • Gear set (differential): $250 – $600 (ring & pinion) plus $200–$400 for installation.

Installation Tips

Installing parts yourself can save hundreds of dollars and give you intimate knowledge of your car. Follow these tips to avoid common rookie mistakes.

  • Read the instructions completely before starting. Many parts ship with model‑specific notes — for example, header instructions will warn you about spark plug boot clearance. Skipping this step can cost you extra hours of rework.
  • Gather all tools and supplies in advance. Beyond wrenches and sockets, you may need a torque wrench, penetrating oil, a ball‑joint press, pickle fork, jack stands, and a floor jack. For engine work, an engine hoist and stand are essential.
  • Use a lift or good jack stands. Never work under a car supported only by a floor jack. B‑bodies are heavy; use quality stands rated for at least 3 tons. Chock the wheels securely.
  • Torque everything to spec. Seat-of-the-pants tight is not enough. Use a torque wrench on critical fasteners: intake manifold bolts, header bolts, lug nuts, and suspension bolts. Over‑torquing can crack cast iron or strip threads.
  • Take pictures before disassembly. This is invaluable for wiring, vacuum lines, and bracket placement. Also tag connectors with masking tape.
  • Test fit parts before tightening. Especially on headers and exhaust systems. Minor adjustments with a soft mallet or by loosening motor mounts can save hours of frustration.
  • Run the engine after installation to check for leaks. Listen for exhaust leaks, check oil pressure, coolant level, and transmission fluid. Drive gently for the first 50 miles, then re‑torque critical fasteners (headers often loosen after heat cycles).
  • Don’t hesitate to ask for help. Online forums like For B Bodies Only have thousands of members who have done the same work. A quick search can save you hours.

Choosing the Right Parts for Your Build

Not every part works well together. Matching components to your engine size, chassis, and driving style is key.

Engine Size and Intended Use

A 440 or 426 Hemi has different needs than a 318 or 360. A stock 318 won’t benefit from a 1,000‑CFM carburetor — it’ll lose low‑end torque. For a street driver, focus on parts that improve torque between 1,500–3,500 RPM: a dual‑plane intake, 600–750 CFM carburetor, and mild cam (duration ~220–230° at .050″). For a weekend strip car, move to a single‑plane intake, 850‑CFM carb, and higher stall converter (3,500+ RPM).

Suspension Tuning

If you’re upgrading power, you need suspension to handle it. On a budget, start with new shocks and a front sway bar. For drag racing, consider adjustable pinion snubbers, CalTrac bars, or split leaf springs. For cornering, replace rubber bushings with polyurethane and install a rear sway bar.

Budget Prioritization

Start with the most impactful upgrades per dollar:

  1. Exhaust headers and free‑flowing exhaust – unlocks existing horsepower.
  2. Ignition upgrade – reliable spark, better throttle response.
  3. Carburetor and intake – often worth 20–40 HP on a stock engine.
  4. Suspension – tightens up the car and gives you confidence.
  5. Brakes – you need to stop what you’ve built.

Where to Buy Mopar B‑body Performance Parts

Sourcing from reputable retailers ensures you get correct fitment and warranty support. Here are trusted options:

  • Summit Racing – huge selection of headers, intakes, carburetors, suspension, and brakes. Fast shipping and good returns.
  • Mopar Performance Parts – official Chrysler catalog for crate engines, electronic ignition, and factory‑style upgrades.
  • Classic Industries – specializes in restoration and performance parts for Dodge and Plymouth muscle cars.
  • Mancini Racing – Mopar‑only focus, excellent for engine internals, transmission parts, and hard‑to‑find items.

Common Mistakes to Avoid

  • Skipping a tune‑up on the stock engine first. Many “performance gains” can be had by simply dialing in timing, replacing plugs/wires, and setting proper fuel mixture. Do that before throwing parts at the car.
  • Over‑carbureting. Too much CFM kills low‑end power and hurts fuel economy. For a 383/440 street engine, 750 CFM is usually plenty; 650 CFM works well on smaller blocks.
  • Ignoring gear ratio. A performance engine with stock 2.76 gears will feel sluggish. Consider swapping to 3.23 or 3.55 gears for a noticeable improvement in acceleration.
  • Not upgrading the cooling system. Higher compression and more power generate extra heat. Make sure your radiator, fan, and water pump are in good shape. A high‑flow thermostat (160°–180°F) is a cheap upgrade.
  • Forgetting drivetrain upgrades. A built engine will shred a stock 7.25″ rear axle. Dana 60 or 8.75″ rearends are popular swaps on B‑bodies.
  • Neglecting to upgrade the wiring. High‑amp alternators and electric fans may require a relay and larger gauge wire. A melted harness can ruin a great build.

Conclusion

Installing Mopar B‑body performance parts is one of the most rewarding ways to personalize your car and unlock its true potential. By understanding the costs involved and following a methodical installation process, you can avoid expensive mistakes and build a car that delivers the performance you’ve always wanted. Start with a realistic budget, do your research on forums and supplier websites, and don’t be afraid to tackle the work yourself — with the right tools and knowledge, even complex upgrades like header swaps or cam installations are within reach. Whether you’re building a daily driver or a weekend warrior, the satisfaction of doing it yourself is every bit as good as the horsepower gains.