the s80's got some good pull, especially for weighing how much it does, but it really fells like it lacks in the low end power. Do you guys have any suggestions that can improve this?

 

Is this a T6? If so, I don't see what the problem is. If it is the non-turbo 2.9, that is a different story. Many people complain about its lack of power and torque for such a massive car. You can try to get a ECU and increase your numbers, but there is no guarantee that you will feel a significant difference. Basically, not much you can do to alter your 0-60 time and acceleration.