If you’re building a high-performance VHR or HR VQ platform, airflow is everything. Upgrading to a ported plenum and ported intake manifold is one of the most effective ways to increase horsepower on the G37 and 370Z, especially for enthusiasts pushing toward the 400 HP range. At Initiate Motorsports, we focus on VQ-specific intake solutions that help HR and VHR engines breathe better, rev harder, and make real power.
Understanding HR and VHR Intake Limitations
The factory HR and VHR intake manifolds and plenums are designed for reliability and emissions, not maximum airflow. As power levels rise, these components become a bottleneck—restricting air volume and unevenly distributing airflow across cylinders.
A ported HR or VHR plenum increases internal volume and improves air distribution, while a ported intake manifold removes casting imperfections and smooths runner transitions. Together, these upgrades significantly improve airflow efficiency and power potential.
Why Ported Plenums Are Critical for G37 & 370Z Builds
For G37 and 370Z owners, a VHR ported plenum is one of the most proven airflow modifications available.
Benefits of a ported plenum include:
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Increased peak horsepower
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Improved throttle response
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More consistent airflow to all cylinders
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Stronger top-end power for high-RPM pulls
When combined with supporting mods, a ported plenum plays a major role in unlocking higher horsepower levels.
Ported Intake Manifolds for HR & VHR Engines
A ported intake manifold is the foundation of a serious HR or VHR build. By reshaping airflow paths and increasing internal efficiency, a ported manifold allows your engine to take full advantage of aggressive tuning, cam profiles, and higher RPM operation.
Key advantages include:
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Increased airflow capacity
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Improved combustion efficiency
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Higher sustained horsepower at high RPM
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Better performance consistency under load
This is especially important for naturally aspirated and boosted G37 and 370Z setups targeting big power.
How HR & VHR Plenums and Manifolds Support 400 HP Builds
Reaching 400 HP on an HR or VHR platform—whether naturally aspirated or forced induction—requires eliminating intake restrictions. A ported plenum and ported intake manifold ensure your engine can move enough air to support larger throttle bodies, upgraded injectors, and advanced tuning strategies.
These intake upgrades maximize the effectiveness of:
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Cold air intake systems
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High-flow exhaust setups
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ECU tuning and data-logged optimization
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Supercharger or turbocharger systems
Compatible Platforms
Our HR and VHR ported plenums and intake manifolds are ideal for:
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Infiniti G37 (HR & VHR)
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Nissan 370Z (HR & VHR)
Whether you’re building a street-driven performance car or a high-horsepower track machine, intake airflow is a non-negotiable upgrade.
Why Choose Initiate Motorsports HR & VHR Intake Upgrades?
At Initiate Motorsports, our HR and VHR ported plenums and manifolds are designed with power goals in mind. Each plenum and intake manifold is carefully ported to improve airflow while maintaining OEM fitment and long-term reliability.
Why builders trust Initiate Motorsports:
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VQ HR & VHR airflow expertise
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Proven gains on G37 and 370Z platforms
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Ideal for 400 HP performance goals
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Precision porting for maximum efficiency
Upgrade Your HR or VHR Intake System Today
If your goal is serious horsepower, faster throttle response, and a clear path toward 400 HP, upgrading to a ported plenum and ported intake manifold is essential.
Browse Initiate Motorsports’ lineup of HR and VHR intake manifolds and ported plenums and take your G37 or 370Z build to the next level.