I am not looking for 600hp to the wheels. I will be using this for a daily driver. My friend has full T28 and he said they didn't start coming on until around 4000 rpm. I will not be doing much if any track time and will not be street racing too much other than to lay the smack down on ocasion. I think the T25/T28 should be capable of 550 to 570hp to the flywheel maybe more?