4JJ3 Denso Brand New Injector Nozzles
Engine: 4JJ3
Vehicle: Isuzu D-MAX, MU-X & Mazda BT-50
Year Model: 2021–Current
Quantity: Set of 4 Injector Nozzles
Increase power and efficiency from your 4JJ3 engine with +70% and +130% Injector Nozzles, designed for high-performance diesel applications.
These nozzles are built to deliver dependable fuel flow and consistent performance in tuned D-MAX, MU-X and BT-50 setups, whether running standard or upgraded turbo systems.
The reduced opening time of GSL nozzles enables an extended, more controlled burn period, delivering cleaner AFRs without increasing fuel consumption.
Click here to purchase an Injector Fit Kit.
These are not part of an exchange program. Your own injectors are fitted with new nozzles and returned to you, ensuring the quality and condition of what you receive.
This approach eliminates the risk of being supplied with heavily worn or high‑kilometre injectors from another source.
Please send your existing injectors to GSL, where the new nozzles will be professionally fitted before being returned to you.
Shipping Address:
GSL FAB
c/o Injectors
5 Freighter Avenue
Wilsonton, QLD, 4350
Please include your online order number inside the package for reference.
Linearisation table provided for the tuner upon request.
Injector Disclaimer
Modified & Oversized Injectors
Where a modified or “+size” injector is marketed or supplied as genuine (including brands such as Denso, among others), this designation applies solely to the injector body and does not extend to the nozzle.
To increase flow capacity, the original nozzle has been altered or replaced. As a result, it is no longer considered an original OEM part. Variations in modification techniques mean that performance, flow rates, and overall behaviour can differ depending on the manufacturer or supplier.
Although the injector body itself remains a genuine OEM component, the nozzle and total flow performance will not match standard factory specifications.
We recommend ensuring your injectors are in good condition prior to nozzle installation. If your injectors have exceeded approximately 130,000 km of use, we advise replacing them with brand-new genuine units to maintain reliability and performance.
