The document describes the performance characteristics of a 2004 Nissan Frontier 2.5 Turbo diesel engine with and without a K 2N modification. It notes that with the K 2N, the engine produces more power at lower RPMs which is beneficial for highway driving. It also has a smoother power delivery and acceleration below 2500 RPM. Above 2500 RPM, both the power and torque outputs see significant gains with the K 2N modification, resulting in better acceleration.

1. Car Model: Nissan Frontier 2.5 Turbo Year: 2004 Fuel/Ignition: Diesel Injection With K ²N Without K ²N The diesel engine power curve clearly shows that at low rpm, the engine can activate more power which use by Most highways or motorways driver. This indicates a smoother and better idling. The 2000 rpm unevenness is smoothed out for smoother power delivery, and smoother acceleration. Above 2500 rpm, the power gain is significant. Figure shows the torque is significantly improve, this indicates a much better pick up and good torque. Above 2500rpm,the torque shows significant improvement with 3100 reach shown the best result using K²N.