440cc Injectors for NA/NB Miata

Name: 440cc Injectors for NA/NB Miata
Brand: DeatschWerks
SKU: 18U-05-0440-4
Price: 206.46 USD
Availability: InStock
Rating: 5.0 (5 reviews)

440cc Injectors for NA/NB Miata - Main image

$206.46 ~~$279~~ In stock

Category: Fuel Injector

DeatschWerks offers a matched set of four 440cc fuel injectors for NA/NB Mazda Miata applications. This set is listed under DeatschWerks vehicle-specific fuel injectors.

Matched set of 4 injectors
440cc flow rating
For NA/NB Mazda Miata
Brand: DeatschWerks
SKU: 18U-05-0440-4

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Customer Reviews (5.0 / 5 · 5 reviews)

Adam ★★★★★ Oct 22, 2026

My '94 Miata's original injectors were tired, so swapping to these 440cc matched sets was a straightforward upgrade. The fuel trim settled perfectly with my ECU, and the idle is smoother than it's been in years.

Adam ★★★★★ Oct 21, 2026

Dropped these into my '99 Miata and the idle smoothed out immediately—no more hunting like with the old ones. They fit the stock rail without any modification, which saved me a headache. Car feels noticeably stronger through the mid-range.

Brian ★★★★★ Oct 20, 2026

The matched set means all four flowed the same out of the box, which saved me the headache of tuning around uneven idle. Install was straightforward, and the car’s been running clean on the stock ECU with a piggyback for a week now.