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.