I have learned a bit more already. Sadly seems any idea of putting old T Bird SC turbo on 3.9 is out. Will look to see if SCTx4 would do much good and if any way to quicken shift delay in manual mode and make shift firmer. Must be all 3.9 cars but mine runs up on limiter much faster than expected and easy to hit cut off waiting for up-shift to respond when pushing car in manual mode. Have heard "talk" that 5R55S trans (I think is correct model in sport sedan) is bit weak so that and 8" rear limits torque it would seem but do not know how much. The variable cam timing or "VVT" is new for me and hi compression is hard to turn up much pressure. I was surprised in again just reading 3.9 comes with plain cast pistons and can not use forced induction on VVT type motor. But was hoping I heard wrong and low pressure with good airflow, 93 octane, faster up-shift by trans, would be doable with good tuner. (that was me hoping I read wrong on VVT and small boost and good flash tune or SCTx4. Not looking for 600+HP more than stock is better and Continental DWS 255X45X17's do let go easier than thought. Thanks much!!