Building a 500 horsepower VQ37 engine with parts from Nismo, Jim Wolf Technology (JWT), and ARK Performance is a goal many Nissan and Infiniti enthusiasts share. It requires a carefully selected combination of bolt-on modifications, tuning, and supporting upgrades. While the original article provided a basic cost outline, the real picture involves much more detail—both in terms of what each part does and how the total investment adds up when you factor in labor, tuning, and reliability upgrades. This expanded guide walks you through the technical choices, price ranges, and hidden costs so you can budget realistically and avoid common pitfalls.

The VQ37VHR Engine: A Strong Foundation

The VQ37VHR is a 3.7-liter V6 that debuted in 2007 in the Nissan G37 (V36 platform) and later powered the 370Z (Z34), Infiniti Q50/Q60, and the Nissan Pathfinder. Its key differentiator from the earlier VQ35 is Nissan’s VVEL (Variable Valve Event and Lift) system, which continuously adjusts intake valve timing and lift. This gives the engine broad torque, high specific output, and excellent low-end response. Factory output ranges from 332 to 350 horsepower (crank) depending on the application. The engine is robust enough to handle 500 crank horsepower on stock internals with proper tuning—though reliability at that level requires careful attention to fuel delivery, ignition, and cooling.

Many builders target 400–450 wheel horsepower (whp), which corresponds to roughly 480–540 crank horsepower considering drivetrain loss. That 500 hp number in the title is likely crank horsepower (or a common rounding of 500 crank). Understanding this distinction matters because wheel horsepower is what you measure on the dyno, and the difference between crank and wheel can be 15–20% on a manual transmission car. So a 500 whp build is significantly more intensive and expensive than a 500 crank build.

The Build Path: Components for 500 Crank Horsepower

To reach 500 crank horsepower reliably on a VQ37 with aftermarket parts, you need to address air flow, fuel flow, engine timing, and exhaust scavenging. The brands you mentioned—Nismo, JWT, and ARK—are well-established in the Nissan performance aftermarket, but they target slightly different aspects. Below we break down each major component category, with real-world pricing as of 2025.

Intake Systems: Getting More Air In

Stock intake systems are restrictive above 400 crank hp. Cold air intakes (CAI) reduce intake air temperature and improve flow. Two options dominate:

  • Nismo Cold Air Intake System – ~$500. A direct-fit, CARB-legal system with dry filters. Good for street-driven cars and builds up to 500 crank hp.
  • ARK Cold Air Intake – ~$500. Similar concept, slightly larger filter area. Both are excellent, though neither is mandatory if you fabricate a custom setup.

For a 500 crank build, an intake is a high-roi part. Expect 10–15 whp gains with proper tuning.

Exhaust Systems: Scavenging Heat

Stock exhaust manifolds and cat-back systems choke the VQ37. Full exhaust systems from Nismo and ARK are popular:

  • Nismo Exhaust System – ~$1,200. A cat-back system with a distinctive tone and good flow. Often paired with the factory Y-pipe.
  • ARK Grip Exhaust System – ~$1,200. A dual rear exit cat-back with Helmholtz resonators to eliminate drone. Rated for up to 600 hp.

At this power level, you should also consider aftermarket headers. Stock exhaust manifolds are a major bottleneck. Many builders opt for JWT or PPE headers (~$800–$1,200). The cost summary in the original article omitted headers—an oversight that can leave 20–30 whp on the table.

Engine Management & Tuning

Tuning is the single most important upgrade. Without a proper calibration, even the best parts won't deliver power.Options:

  • JWT ECU Tune – ~$600. JWT reflashes the stock ECU with a specialized tune for their cams and supporting mods. Includes remote tuning support.
  • Nismo Performance ECU Tune – ~$600. A dealer-installed reflash that works with Nismo intake/exhaust. Not as aggressive as JWT.
  • ARK UpRev or ECUTEK Tune – ~$500–$700. Most tuners prefer ECUTEK for VQ37s because of advanced features like flex-fuel support and launch control.

For 500 crank hp, a standalone ECU (like MoTeC or Haltech) is overkill unless you also plan to go forced induction later. A well-done ECUTEK or JWT reflash will suffice.

Camshafts & Valve Train (JWT Specialty)

JWT is famous for its camshaft offerings for the VQ37. The stock camshafts are designed for emissions and fuel economy; aftermarket cams increase lift and duration to let more air in at high rpm.

  • JWT Performance Camshafts (VQ37VHR) – ~$1,000. These drop-in cams work with stock valve springs up to about 7,200 rpm. For 500 crank hp, you'll likely need stiffer springs and retainers (add ~$400–$600 for JWT springs/titanium retainers).
  • JWT High-Performance Fuel Injectors – ~$700. ID or DeatschWerks injectors sized at 700–1,000 cc/minute. Required to support the fuel flow at 500 hp.

Installing cams on the VQ37 requires removing the VVEL actuators and timing chains—a labor-intensive job (10–15 hours). Expect $1,200–$2,500 in labor for cam/spring/injector installation.

Fuel System: Pressure and Volume

Stock fuel injectors are maxed out around 420–450 crank hp. To safely run 500 crank hp, you need:

  • Higher flow injectors (as above) ~$600–$800.
  • Fuel pump upgrade – Walbro 525 or AEM 340lph ~$150–$250. Many tuners also recommend a voltage booster (e.g., Kenne Bell Boost-A-Pump) or a return-style fuel system for E85 compatibility.
  • Fuel pressure regulator – ~$150–$300.

If you plan to run E85, you'll need much larger injectors and possibly a dedicated flex-fuel sensor (>$200).

Additional Bolt-Ons from ARK

The original article lists an ARK underdrive pulley kit at $300. Underdrive pulleys reduce parasitic drag on the crankshaft and accessory drives, freeing up 5–10 whp. However, they can disrupt alternator output at idle—and some aftermarket pulleys cause belt slip on high-rpm engines. For a 500 hp daily driver, I advise staying with stock pulleys or using a fluidampr harmonic balancer for reliability.

Updated Cost Breakdown (Parts Only)

Here is a more complete parts list for a 500 crank hp VQ37 build using the three brands, plus necessary supporting components:

  • Nismo cold air intake – $500
  • Nismo cat-back exhaust – $1,200
  • JWT cams + springs/retainers – $1,600 (cams $1,000 + springs $600)
  • JWT fuel injectors (700cc) – $700
  • JWT ECU reflash – $600
  • ARK Grip exhaust (alternative to Nismo) – $1,200
  • Aftermarket headers (not listed in original but essential) – $1,000 (e.g., PPE or JWT)
  • High-flow catalytic converters or test pipes – $300–$500
  • Upgraded fuel pump – $200
  • Upgraded spark plugs (NGK LTR6IX-11) – $50

Total for parts (without duplication): $6,500–$7,000. That’s similar to the original article’s $6,600, but note I added headers and fuel pump—critical omissions.

Labor Costs: The Largest Variable

Unless you have a full shop and experience with VQ37 timing chains, expect to pay heavily for installation. Major labor items:

  • Intake & exhaust – 2–4 hours @ $100–$150/hr = $200–$600
  • Headers – 4–6 hours (tight access) = $400–$900
  • Camshafts/springs – 10–15 hours (requires timing chain removal) = $1,000–$2,250
  • Injectors & fuel pump – 3–5 hours = $300–$750
  • Professional dyno tuning (including wideband, 2–4 hours) – $500–$1,000

Estimated total labor: $2,400–$5,500. A turnkey build with all parts installed professionally can easily run $10,000–$13,000 parts plus labor.

Supporting Modifications for Reliability at 500 HP

At 500 crank horsepower, the drivetrain and cooling system need attention. Here are common upgrades not yet mentioned:

Cooling System

The VQ37 runs hot during aggressive driving. An aluminum radiator (Koyo, Mishimoto) – $300–$500, high-flow thermostat – $50, and upgraded oil cooler (Setrab or JWT) – $300–$600, are recommended. Overheating on track or repeated pulls can cause detonation and damage.

Clutch & Flywheel

The stock clutch can’t hold 430 lb-ft of torque (typical at 500 hp). Look at a twin-disc clutch (South Bend, JWT, Competition Clutch) – $800–$1,600. Lightweight flywheel (JWT or Fidanza) – $400–$600. Installation labor: 4–8 hours.

Differential & Gearing

Many 370Z/G37 owners upgrade to a limited-slip differential (OS Giken, Quaife) – $1,200–$2,000, or at least swap to a shorter final drive ratio (3.7 or 4.08) to make better use of the power. Not strictly necessary for 500 crank, but recommended for streetable acceleration.

Reinforced Engine Mounts

Polyurethane or solid mounts reduce wheel hop and protect the drivetrain. ~$200–$400.

External Resources & Further Reading

To make informed decisions, reference these sources:

Sample Build Scenarios: Budget vs. Premium

Budget Build (~$8,000 total parts + labor)

  • Used/refurbished OEM cams & stock engine – skip JWT cams for now
  • ARK cold air intake + ARK cat-back + PPE headers – $2,200
  • UpRev tune + injectors + fuel pump – $1,200
  • Self-install everything except tuning – save $2,000+
  • Result: ~450 crank hp, with headroom for cams later

Premium Build (~$13,000–$15,000 total parts + labor)

  • JWT cams, springs, retainers, injectors, tune, headers, full Nismo/ARK exhaust
  • Professional installation including clutch, radiator, oil cooler
  • ECUTEK dyno tune on 93 octane or E85
  • Result: 500–520 crank hp, rock-solid reliability

Conclusion: The True Cost of 500 HP in a VQ37

Building a 500 horsepower VQ37 with Nismo, JWT, and ARK parts is absolutely achievable, but the original article’s $6,600 parts-only figure is incomplete. A realistic budget including necessary supporting modifications (headers, fuel pump, cams, springs, clutch, cooling) and professional labor falls between $10,000 and $15,000. If you can perform all installation yourself and source used parts, you can trim that to around $7,000–$8,000. The engine itself is stout—focus on a comprehensive tune, adequate fuel delivery, and proper cooling. With the right combination, you’ll have a reliable, thrilling 500-horsepower street machine that punches well above its weight.