Power Steering Pump with Pulley 21-394 fit for 370Z and Select

Our review of the Power Steering Pump with Pulley 21-394 finds it best suited for owners who need a direct OE-style replacement for selected Nissan 370Z and Infiniti models; the single biggest reason to buy is compatibility with a long list of model years and part references, which makes it a practical repair item when the original pump fails. This review is written for DIY mechanics and repair shops looking for a plug-and-play swap to restore smooth steering and reduce whining or stiffness during turns.

Key Features

• Wide vehicle fitment: Designed to fit a variety of Nissan 370Z and Infiniti models from 2008 through 2020, helping you find a match for many common chassis and model years.
• OE replacement references: Matches reference part numbers such as 21-394 and 49110-1CB0B, which simplifies verifying compatibility with an existing pump.
• Noise reduction: Built to quiet common whining associated with failing pumps, improving cabin comfort during steering.
• Restores steering response: Addresses symptoms like slow steering response and stiffness so wheel movement becomes smoother and more predictable.
• Installation guidance: The listing recommends professional installation to avoid damage during setup and initial testing, which helps protect the unit and vehicle systems.

Who It's For

This pump is for owners of 2009-2020 Nissan 370Z 3.7L and a range of Infiniti models including G37, Q50, Q60, EX35, Q70, QX70, QX50, M37, M35 and FX35/FX37 who need a compatible OE-style replacement part. It suits DIY mechanics comfortable verifying part numbers and performing or supervising a steering pump swap, or independent shops that perform routine power steering repairs.

It is not for buyers who lack the ability to confirm their exact part number or those who need a universal or performance steering upgrade; the unit is intended as a like-for-like replacement rather than a modified or performance part.

Pros & Cons

Pros

• Good fitment across many Nissan and Infiniti model years, reducing compatibility guesswork.
• Appears to restore steering function and reduce whining when replacing a worn unit.
• Customers report solid value and straightforward direct-swap installation in many cases.

Cons

• Noise reports are mixed for some users, so a small number may notice residual or different noise behavior after installation.
• Professional installation is recommended, which adds cost if the buyer cannot install it themselves.

Specifications

Our Verdict

The Power Steering Pump 21-394 is a sensible OE-style replacement for owners of compatible Nissan 370Z and many Infiniti models who want to restore normal steering feel and reduce whining. It represents good value for a direct-swap repair part, provided buyers verify the required part number and accept that professional installation may be the safest route.

Frequently Asked Questions

Will this fit my vehicle?
Check the listed reference part numbers and the vehicle years and models in the product description, and use the sites fitment check to confirm before ordering.

Does it reduce steering noise?
The pump is designed to quiet common whining from failing pumps, but some users report mixed noise results depending on installation and vehicle condition.

Can I install it myself?
Some buyers report an easy direct-swap installation, but professional installation is recommended to avoid damage and ensure proper testing.