For longtime Nissan 350Z and Infiniti G35 enthusiasts, certain parts are more than just upgrades — they’re legends. One of those legends is the APS Tallboy upper intake manifold, a component that became highly sought after in the mid-2000s before being discontinued nearly a decade ago. Today, we’re proud to bring that iconic design back to life with our Hi-Flow Upper Intake Manifold Plenum for the Nissan 350Z / G35 VQ35DE 3.5L.
This isn’t just a re-release — it’s a revival.
A Look Back: The Original APS Tallboy Plenum
When APS (Air Power Systems) originally introduced the Tallboy plenum for the VQ35DE, it quickly earned a reputation for delivering real, measurable performance gains. The factory VQ35DE upper intake was known to suffer from uneven airflow distribution, particularly starving the rear cylinders at higher RPM. APS addressed this issue with a taller, freer-flowing plenum design that improved volume and airflow balance across all cylinders.
Back in the day, dyno results consistently showed:
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Noticeable gains in mid-range torque
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Improved top-end horsepower
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Smoother throttle response
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Better cylinder-to-cylinder airflow consistency
Because of these results — and limited production — the APS Tallboy plenum became a must-have part for naturally aspirated and boosted VQ builds alike. Once it was discontinued, remaining units became nearly impossible to find, often trading hands at inflated prices.
Bringing It Back — The Right Way
Recognizing the demand and the legacy of this intake, we decided it was time to bring it back — properly. Our APS Tallboy–style Hi-Flow Upper Intake Manifold Plenum is engineered to capture the same performance philosophy that made the original so effective, while ensuring modern manufacturing quality and availability.
This plenum is designed specifically for the VQ35DE 3.5L engine, making it an ideal upgrade for:
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Nissan 350Z
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Infiniti G35
By increasing plenum volume and optimizing airflow, this intake helps the engine breathe more efficiently under load — especially where the factory design falls short.
Why This Upgrade Still Matters Today
Even years later, the VQ35DE remains one of Nissan’s most popular and mod-friendly engines. Whether you’re running bolt-ons, planning forced induction, or simply looking to maximize naturally aspirated performance, proper airflow is key.
This plenum delivers:
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Improved airflow efficiency
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Better throttle response
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Enhanced power delivery at higher RPM
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A proven design rooted in real-world results
Most importantly, it fills a massive gap in the market left behind when APS discontinued the original Tallboy plenum.