The 2.5 is a very good engine,yes it's slow but not too bad at all with EFI, the carbed model has its problems.You can get pretty good mileage with it and it will pull well off road although slowly up any steep hill and is just not the 4.0 to say the least. I have had them since 84 and had several go over 250k. They will last especially if you keep that radiator flowing as it tends to clog at the bottom.I have also had several 4.0 models.They have the punch and speed. If you really like to go fast and need lots of torque the 4.0 is your engine.I will say the 2.5 will do what you need, but slowly. The EFI models have a little more punch.Replace the YFA Carter carb on the early ones with the Weber and you'll pick up a decent bit of power.Don't automatically knock the 2.5, it doesn't deserve it.