Air and Fuel› Fuel Injection Systems and Components - Electronic

FlowForce

Fuel Injector Kit

$319.13

SKU: FF640

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Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The FlowForce FF640 is a plug-and-play injector kit designed for NA/NB Miatas from 1990-2005. These injectors flow at 640cc in NA models and 725cc in NB models, providing clean idle quality and headroom for performance builds. They are matched within +/-1% flow rate at both idle and wide open flow. This kit is suitable for turbocharged builds aiming for approximately 300-350hp.
Show original supplier description
The FlowForce FF640 is a flagship plug-and-play injector kit designed for NA/NB Miatas, delivering 640cc flow in NA models and 725cc in NB models. Each set begins with new OEM EV14 injectors, meticulously flow-matched to within a tight +/-1% tolerance at both idle and full flow rates. This precise matching is crucial for maintaining drivability, especially in a 4-cylinder engine. These injectors are rated for approximately 300-350 horsepower on a turbocharged setup, making them a suitable choice for many Miata performance projects. The kit includes carefully designed components to ensure a plug-and-play installation experience for 1990-2005 Mazda Miatas. However, the installation and proper functioning of these injectors necessitate a standalone engine management system and ECU tuning. For optimal performance and safety, FlowForce recommends consulting their installation and configuration guidelines available online. Buyers may also consider adding a DW200 fuel pump, offered at a promotional price with the injector kit, which is designed to use stock wiring and typically requires no immediate tuning adjustments.

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

BrandFlowForce
Part NumberFF640
CategoryAir and Fuel

Videos

FlowForce 640CC Injectors | Start of NB Miata Turbo Build

FlowForce 640CC Injectors | Start of NB Miata Turbo Build

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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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