The Datsun 240Z remains one of the most beloved classic sports cars, combining sleek lines with a lively inline-six engine. For enthusiasts looking to sharpen performance without spending a fortune, a targeted set of modifications under $1,000 can transform both power delivery and the exhaust note. This guide covers the most effective budget-friendly upgrades—from induction and exhaust to suspension and tires—each chosen to deliver noticeable gains in real-world driving. Whether you're building a weekend canyon carver or just want more punch from your daily driver, these mods offer the best return on investment for under $1,000.

1. Cold Air Intake – The Foundation of Breathing

A cold air intake is one of the most straightforward ways to improve the 240Z's performance. The stock airbox restricts airflow; replacing it with a free-flowing intake tube and a high-quality conical filter allows the engine to inhale cooler, denser air. This reduces restriction and can add 5-10 horsepower with a corresponding improvement in throttle response.

Cost range: $50–$150. Kits from MSA (Motorsport Auto) or Z Car Source include all necessary brackets and tubing. For best results, position the filter away from engine heat—many builders route it into the front fender well. The sound changes noticeably: a deeper induction roar that hints at the engine's potential without being obtrusive.

Installation Tips

  • Remove the old airbox and rubber intake hose.
  • Fit the new intake tube onto the throttle body using a silicone coupler and T-bolt clamps.
  • Secure the filter in a location that avoids hot air from the radiator or exhaust manifold.
  • Check that the MAF sensor (if equipped) is properly seated and oriented.

2. Performance Exhaust System – Unleash the Straight-Six Sound

Next to an intake, a performance exhaust is the most common upgrade. The stock 240Z exhaust is heavily muffled and restrictive. Replacing the system with a free-flowing header (or at least a performance downpipe) and a mandrel-bent exhaust tube with a straight-through muffler reduces backpressure, allowing the engine to exhale freely. Gains of 8-12 horsepower are realistic, and the sound becomes deeper and more aggressive—especially when combined with a cold air intake.

Cost range: $200–$400 for a cat-back system; $150–$300 for a header. Budget-conscious owners often start with a high-flow muffler and custom mid-pipe. A popular choice is the MSA 2.5-inch exhaust system with a Magnaflow or Borla muffler. Expect a noticeable drop in weight compared to the stock boat-anchor exhaust.

Sound and Tuning Considerations

  • Pairing a header with a free-flowing exhaust can make the car louder—be mindful of local noise ordinances.
  • Using a resonated mid-pipe reduces drone on the highway without sacrificing flow.
  • An aftermarket exhaust may require re-jetting the carburetors (if your car still runs SUs or Webers) to maintain proper air-fuel ratios.

3. ECU Tune (For Late-Model 240Zs with Stock EFI)

If your 240Z has the later L28E fuel injection (1975 and later), an ECU tune offers impressive gains without touching hard parts. Aftermarket programmers like the ZTech Performance Standalone are not in budget, but a reflash or a chip replacement can sharpen fuel and timing maps. Gains of 5-8 horsepower are common, with improved drivability and throttle response.

Cost range: $100–$250 for a chip or mail-in tune. For California cars with smog requirements, look for a tune that retains emission compliance. The main downside: limited to fuel-injected models. For carbureted cars, the equivalent is re-jetting or switching to a performance carb.

4. Lightweight Flywheel – Quicker Revs, Better Response

Installing a lightweight flywheel reduces rotational inertia, allowing the engine to accelerate and decelerate faster. The stock flywheel weighs around 25-30 lbs; an aftermarket unit like the Fidanza or JWT aluminum flywheel can drop that to 12-16 lbs. The result is a livelier feel—especially in the lower gears—and easier rev-matching during downshifts.

Cost range: $200–$350 for the flywheel itself. Installation typically requires removing the transmission, so budget $200-$400 for labor if you don't DIY. Many owners pair the lightweight flywheel with a stronger clutch (e.g., ACT or Centerforce) that adds another $150-$250, but the flywheel alone stays under budget if you install it yourself.

Trade-offs

  • A lighter flywheel can make the car more jerky in stop-and-go traffic—some daily drivers prefer a mild weight reduction (e.g., 18 lbs) rather than an ultra-light unit.
  • The engine may be harder to start on cold mornings because it has less momentum to keep spinning.
  • Expect a slightly different clutch engagement feel; you may need to re-learn the slip point.

5. Upgraded Ignition System – Spark Precision

A strong, consistent spark is critical for complete combustion, especially in an older engine that may have tired spark plugs or corroded wires. Upgrading to a performance ignition—such as an MSD 6A digital ignition box, high-output coil, and high-quality spark plug wires—can restore power that has been lost due to ignition inefficiency. Gains of 3-5 horsepower are typical, but the main benefit is smoother idle and better throttle response.

Cost range: $100–$200 for a basic kit (coil, wires, plugs). An MSD 6A can be found for around $150 used, but new kits run $200-$250. If budget allows, consider a Pertronix Ignitor II module to replace the stock points—this gives a more reliable spark without external boxes.

  • NGK BPR6ES spark plugs (or equivalent) – about $2 each.
  • MSD 8.5mm Super Conductor spark plug wires – $50-$70.
  • Blaster 2 or MSD HVC coil – $40-$60.
  • Pertronix Ignitor II (if converting from points) – $80-$100.

6. Sway Bars – Sharper Cornering for Under $200

The 240Z's stock suspension is capable, but body roll can make it feel vague in tight corners. Upgrading to stiffer sway bars (22-25 mm front, 19-22 mm rear) reduces roll and keeps the tires planted. This is one of the best handling mods for the money—the car turns in more crisply and feels more stable through sweepers.

Cost range: $150–$250 for a front-and-rear set. Brands like ST Suspensions, Eibach, or MSA sell direct-fit bars with polyurethane bushings. Installation is straightforward—mount the bars to the control arms and frame using supplied hardware. Expect a firmer ride on rough pavement, but nothing unbearable.

Additional Handling Upgrades That Fit the Budget

  • Polyurethane control arm bushings ($50-$100) reduce deflection and improve steering feel.
  • Rebuilding the stock struts with KYB or Tokico inserts ($100-$200) can transform ride quality if the old ones are worn.

7. Suspension Upgrade – Shocks and Springs Combo

If your 240Z still drifts on aging shocks and sagging springs, a budget coil-over kit or matched shock/spring set is the most impactful modification you can make. Ride quality and handling both benefit—a car that rides on worn suspension cannot put power down effectively. A basic set of Monroe or KYB gas shocks combined with MSA lowering springs (1-1.5 inch drop) costs around $250-$400 and completely transforms the chassis.

Cost range: $200–$400. Installation is DIY-friendly on the 240Z; the rear shocks are easily accessible in the wheel well, and the front struts can be removed with basic tools. Remember to get an alignment after lowering.

8. Performance Tires – The Only Contact Patch

Upgrading to modern high-performance tires is non-negotiable if you've installed any of the previous power mods. A car with 150–170 horsepower needs tires that can transfer that force to the pavement. Entry-level summer tires from brands like Kumho, Falken, or Firestone (195/60R14 or 205/60R15) provide vastly more grip than aging all-season tires. Expect sharper turn-in and shorter braking distances.

Cost range: $300–$600 for a set of four. Check the Z Car community forum for current tire deals. Even a $500 tire budget leaves room for other mods if you allocate carefully.

9. Budget-Friendly Add-Ons (Under $100 Each)

High-Flow Air Filter

Replace the paper filter with a K&N drop-in (for stock airbox) for about $40. Gains are modest (2-3 hp) but the filter is reusable and improves throttle response.

Intake Manifold Spacer

A phenolic spacer between the intake manifold and the head reduces heat soak from the exhaust-side heat. Gains 1-2 hp and helps fuel consistency. Cost $30-$60.

Electric Fan Conversion

Replace the mechanical clutch fan with an electric puller fan (e.g., Spal 12-inch) to free up 5-8 parasitic horsepower. Cost $80-$120. Requires a switch and wiring, but the power gain is noticeable at low RPM.

Re-jetting or Tuning Weber / SU Carbs

If your car has aftermarket carburetors, a proper tune with correct jet sizes from a Z specialist like ZTherapy can unlock 10+ horsepower. Cost for a rebuild kit and jets is under $50 (DIY) or $200-$300 if professionally tuned.

Planning Your $1,000 Budget

Prioritize the modifications that work together. A common order for maximum impact:

  1. Cold air intake ($100) – easy power and sound.
  2. High-flow muffler or cat-back exhaust ($200)
  3. Ignition upgrade ($150) – improves drivability.
  4. Sway bars ($200) – transforms handling.
  5. Performance tires ($350) – the foundation of traction.

This totals ~$1,000 and gives a balanced mix of power, sound, and handling. If you already have good tires, substitute a lightweight flywheel or suspension upgrade.

Final Word – Best Bang for Your Buck

The Datsun 240Z responds beautifully to careful, budget-conscious upgrades. An intake, exhaust, and ignition refresh will wake up the engine, while a set of sway bars and modern tires make the chassis dance. None of these mods require a second mortgage—a $1,000 budget is realistic for a significant transformation. Always buy quality parts from reputable Z specialists (such as ZCar Depot or Motorsport Auto) and check forums like HybridZ for installation guidance and used parts. With a little elbow grease, your 240Z will sound and perform better than ever—without breaking the bank.