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Air and Fuel› Fuel Injection Systems and Components - Electronic

Nostrum

Upgrade Injector Set 24% Mass Flow Increase

$1,799.00 $1,659.99 Save $139.01

SKU: H720-2106

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Nostrum Upgrade Injector Set is a high-performance direct fuel injector kit engineered for the Subaru FA24 engine. These injectors provide a 24% mass flow increase over stock while maintaining an OEM-equivalent spray pattern for optimal combustion efficiency.

Designed as a direct-fit replacement, each set includes four serialized, flow-matched injectors with custom harness connectors for improved clearance. The components support power levels up to 600 WHP on gasoline and 480 WHP on E85.
Show original supplier description
The Nostrum Upgrade Injector Set offers a robust fueling solution for Subaru FA24 platforms, specifically designed to support high-performance builds without sacrificing drivability or idle quality. By providing a 24% increase in mass flow over stock, these injectors ensure consistent fuel delivery under high-load conditions while maintaining precise spray atomization to prevent fuel wash and oil dilution. A key design detail includes an extended harness connector on one injector to ensure proper clearance of the cast aluminum coolant crossover pipe on the FA24 engine, simplifying installation compared to non-optimized alternatives. Professional installation is highly recommended due to the sensitive nature of high-pressure fuel system components. ECU tuning is required for proper operation, specifically to calibrate fuel delivery, trims, and cold-start behavior; use of the COBB tuning suite is recommended for this purpose. These injectors are fully E85 compatible, allowing for flexible fueling options. Compatibility covers 2022-2026 Subaru WRX (FA24F), 2019-2026 Subaru Ascent, 2020-2026 Subaru Legacy XT/Sport, and 2020-2026 Subaru Outback XT/Wilderness models. For maximum performance, pairing these injectors with a high-flow fuel pump upgrade is advised to ensure adequate supply under boost.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandNostrum
Part NumberH720-2106
CategoryAir and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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