4JJ3 Bolt-On Intercooler Upgrade 2020+ Dmax/BT50 – FLEX

4JJ3 Bolt-On Intercooler – FLEX Monoblock Bolt-On Performance Intercooler

Step up your cooling performance with the FLEX Monoblock Bolt-On Intercooler, engineered specifically for 4JJ3-powered builds. Designed as a direct-fit upgrade for 2020+ Isuzu D-MAX, 2021+ MU-X, and 2020+ Mazda BT-50 (pre-facelift), this heavy-duty intercooler is built to deliver maximum reliability and efficiency in demanding conditions.

Key Features:

• Direct bolt-on fitment – installs into factory location, no fabrication required

• One-piece monoblock casting – stronger, leak-free design with no welds

• Handles up to 80 PSI of boost – ideal for tuned or heavy-use applications

• Improved charge cooling – lowers intake temperatures and reduces heat soak

Specifications:

• Brand: FLEX

• Core size: 620 × 252 × 63.5 mm

• Vehicle Fitment:

  • Isuzu D-MAX 2020+ (RG series, 4JJ3)

  • Isuzu MU-X 2021+ (RG series, 4JJ3)

  • Mazda BT-50 2020+ (TF series, 4JJ3, pre-facelift)

The FLEX Monoblock Bolt-On Performance Intercooler is the ultimate cooling upgrade for 4JJ3 platforms, delivering strength, efficiency, and reliability for serious performance builds.