Here's why:
* Performance Focus: The RB25DET was primarily designed for performance and power output, making it less likely to include emissions-focused features like EGR.
* Engine Design: The RB25DET is a naturally aspirated engine with a relatively simple design, and adding an EGR system would require additional components and complexity.
* Emissions Standards: While emissions regulations were stricter than the past, they weren't as stringent during the era of the RB25DET, so the engine didn't necessarily need an EGR system to meet those requirements.
However, it's important to note that some aftermarket modifications or conversions may have included EGR systems on RB25DET engines. This could be done for various reasons, such as:
* Emissions Compliance: In some regions, modifications might be needed to achieve legal emissions levels.
* Performance Tuning: Some tuners may add EGR systems for specific tuning objectives, although this is less common.
Therefore, it's essential to clarify the specific vehicle and its modifications to determine whether an EGR system is present.
If you're unsure about your RB25DET engine, it's best to consult the vehicle's documentation or a qualified mechanic to confirm whether it has an EGR system.
