DeatschWerks 18U-05-0440-4 440cc EV14 Injectors 1990-2005 Mazda MX-5 Miata NA NB

Vehicle Fitment

• 1990-1997 Mazda MX-5 Miata NA (1.6L B6-ZE, All Trims)
• 1999-2005 Mazda MX-5 Miata NB (1.8L BP-4W / BP-Z3, All Trims)

Fitment Notes

• Fits both NA (1990-1997) and NB (1999-2005) Miata generations - mates directly to the OEM fuel rail, intake manifold, and wiring harness with no modification required
• Covers both the 1.6L B6-ZE (NA) and 1.8L BP (NB) engines - same injector body and connector across both generations
• USCAR connector - compatible with OEM and aftermarket ECUs for all listed NA/NB applications
• Does NOT fit the NC Miata (2006-2015) - that generation uses a different injector; see DeatschWerks 18U-00-0440-4
• Does NOT fit the ND Miata (2016+)
• Tuning is required after installation - tuning data is available on the DeatschWerks website
• Not legal for sale or use in California on pollution-controlled motor vehicles (no CARB EO)

Features

• 440 cc/min flow rate - a significant upgrade over OEM for turbocharged or supercharged NA/NB Miata builds
• Bosch EV14 injector body - precision spray pattern and atomization across a wide operating range
• Set of 4 - covers all four cylinders of the B6-ZE and BP inline-4 engines
• Dynamically flow matched to within 1-2% variation across the set for balanced fueling and smooth idle
• Drop-in OEM fit - engineered to fit the stock NA/NB fuel rail and harness without modification
• E85 compatible - stainless steel internals support gasoline, E85, and methanol blends
• Full flow report included - tuning data also available at deatschwerks.com
• Limited Lifetime Warranty

Specifications

• Part Number: 18U-05-0440-4
• Flow Rate: 440 cc/min (41.8 lb/hr @ 43.5 PSI)
• Injector Body: Bosch EV14
• Connector Type: USCAR
• Injector Style: Top Feed
• Impedance: High
• Quantity: Set of 4
• Compatible Engines: Mazda B6-ZE 1.6L, Mazda BP 1.8L (BP-4W / BP-Z3)
• Fuel Compatibility: Gasoline, E85, Methanol blends
• Flow Matching Tolerance: Within 1-2% dynamic variation
• Flow Report: Included
• CARB Approved: No
• Warranty: Limited Lifetime

Included Components

• 4x DeatschWerks 440cc Bosch EV14 Top Feed Fuel Injectors (USCAR connector)
• Flow Report
• O-rings and seals

Product Description

The DeatschWerks 18U-05-0440-4 is a matched set of four 440cc/min Bosch EV14 fuel injectors engineered specifically for the 1990-2005 Mazda MX-5 Miata, covering both the NA generation (1990-1997, 1.6L B6-ZE) and the NB generation (1999-2005, 1.8L BP). Both generations share the same OEM injector body and USCAR connector configuration, making this a single drop-in set that covers the full classic Miata range without modification to the fuel rail, manifold, or wiring harness.

At 440cc/min, these injectors provide substantial headroom over OEM for turbocharged, supercharged, or nitrous NA/NB builds. Bosch EV14 construction ensures excellent spray pattern, E85 compatibility, and reliable long-term performance. Every set is dynamically flow matched to within 1-2% and ships with a flow report; additional tuning data is available at deatschwerks.com. Note: this part does not fit the NC (2006-2015) or ND (2016+) Miata. Tuning is required after installation. Not CARB-approved.