The 4.0L 1GRFE engine, marked by the 5th digit VIN U and tailored for X Runner models, is a high-performance used engine choice ideal for dynamic driving needs. This naturally aspirated V6 engine features sequential multi-port fuel injection for precise fuel control, contributing to both power and efficiency. The DOHC setup with performance-tuned timing enhances responsiveness, making this engine a great fit for drivers looking for a powerful and reliable used engine specifically designed for the X Runner. It provides optimal performance for adventurous and demanding conditions.