When it comes to extracting real power from HR and VHR VQ engines, intake airflow is one of the biggest limiting factors. For G37 and 370Z owners aiming for aggressive performance goals and approaching the 400 horsepower range, upgrading to a ported intake manifold and ported plenum is a proven move. At Initiate Motorsports, we build VQ intake solutions specifically for high-output HR and VHR applications.
Why HR and VHR Engines Benefit So Much from Ported Intakes
The factory HR and VHR intake manifolds and plenums are efficient for stock power levels, but once supporting mods are added, they quickly become restrictive. Uneven airflow, sharp internal transitions, and limited plenum volume all cap horsepower potential.
A ported plenum increases usable air volume and improves distribution, while a ported intake manifold smooths runner flow and eliminates bottlenecks. Together, these upgrades allow the engine to breathe efficiently at higher RPMs—exactly where HR and VHR engines shine.
G37 and 370Z Plenum Upgrades Explained
For both G37 and 370Z platforms, the VHR plenum plays a major role in throttle response and top-end power.
Benefits of upgrading to a ported plenum include:
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Improved airflow balance across cylinders
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Increased top-end horsepower
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Faster throttle response
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Better performance consistency during high-RPM pulls
These gains become especially noticeable on tuned cars and vehicles running upgraded throttle bodies or forced induction.
Ported Intake Manifolds: Unlocking HR & VHR RPM Potential
A ported intake manifold is essential for HR and VHR builds pushing the limits of the factory intake system. Proper porting reshapes airflow paths, increases runner efficiency, and reduces turbulence—allowing the engine to maintain airflow as RPM climbs.
Advantages include:
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Increased airflow capacity
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Improved combustion efficiency
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Stronger power delivery past 6,000 RPM
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Increased support for high-horsepower tuning strategies
This makes ported manifolds a must-have for both naturally aspirated and boosted G37 and 370Z setups.
Supporting Mods for 400 Horsepower HR & VHR Builds
Reaching the 400 horsepower level requires a complete airflow strategy. A ported plenum and ported intake manifold work best when paired with:
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Cold air intake systems
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High-flow exhaust components
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ECU tuning and data logging
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Supercharger or turbocharger kits
Without intake upgrades, many of these mods cannot reach their full potential.
Compatible HR and VHR Platforms
Initiate Motorsports ported intake manifolds and plenums are designed for:
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Infiniti G37 (HR & VHR)
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Nissan 370Z (HR & VHR)
Whether you’re chasing peak numbers or building a reliable high-performance street car, intake airflow is a critical foundation.
Why Initiate Motorsports HR & VHR Intake Solutions Stand Out
At Initiate Motorsports, every HR and VHR intake manifold and plenum is ported with performance as the priority. Our approach focuses on real-world gains, OEM fitment, and long-term durability.
Why builders choose us:
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Deep VQ HR & VHR platform knowledge
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Precision porting for maximum airflow
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Proven results on G37 and 370Z builds
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Designed to support 400 horsepower goals
Take Your G37 or 370Z Intake System to the Next Level
If you’re serious about unlocking more horsepower from your HR or VHR engine, a ported intake manifold and ported plenum should be at the top of your upgrade list.
Explore Initiate Motorsports’ lineup of HR and VHR intake upgrades and build your G37 or 370Z the right way—from the intake forward.