Faster spool and stronger mid-range response are key advantages when upgrading the turbo on an RB25DET. The Tomei ARMS BX8265 Ball Bearing Turbocharger Kit (part number TB403A-NS06A) is a complete bolt-on solution developed for Nissan’s RB25DET engine, combining a high-flow billet compressor wheel with a dual ball-bearing center section capable of supporting approximately 450 horsepower with proper supporting modifications.
The kit features a CNC-machined billet compressor wheel that improves airflow and efficiency over traditional cast designs, paired with a ball-bearing cartridge that reduces friction and allows the turbo to reach boost more quickly than a comparable journal-bearing unit. A multi-rate billet actuator is included along with six springs, giving tuners the ability to fine-tune boost pressure for different engine setups and driving styles. Engineered as a direct-fit upgrade for the RB25DET, the BX8265 includes the necessary gaskets, oil lines, hardware, and related components for installation.
This turbocharger is well suited to R33 and R34 Skyline models equipped with the RB25DET that prioritize responsive power delivery along with solid peak output. At Terra Firma Automotive, we supply this genuine Tomei ARMS BX8265 Ball Bearing Turbo Kit as a high-performance Japanese upgrade for RB25DET engines. Whether the goal is a sharper street car or a higher-output track-oriented setup, the BX8265 delivers the spool characteristics and airflow expected from Tomei’s ball-bearing ARMS series. Choose Terra Firma Automotive for authentic Tomei turbocharger systems that elevate the performance of the RB25DET platform.
- Genuine Tomei ARMS BX8265 Turbocharger Kit
- Part Number: TB403A-NS06A
- Application: Nissan RB25DET
- Fitment: Skyline models with RB25DET (R33 GTS25T, R34 GT/GTT, etc.)
- Fits Both NEO and Non-NEO RB25
- Ball bearing (B/B) center section
- CNC billet compressor wheel
- Compressor inducer: 54.8 mm / exducer: 76.2 mm
- Multi-rate billet actuator
- Includes 6 springs for boost adjustment
- Supports approximately 450 HP with supporting mods
- Faster spool compared with journal-bearing equivalents
- Bolt-on style upgrade for RB25DET
- Includes gaskets, oil lines, and necessary hardware
- Improved response and airflow versus stock turbo
- Trusted Tomei ARMS series engineering
- Available from Terra Firma Automotive
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