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I just took delivery of my STX with the 4.6 and to be honest I was a little disappointed in the power. I guess I expected a little bit more since my only other expierence (seat time) behind the wheel of a vehicle with the 4.6 was my wifes 06 Mustang GT. Anywho what are the best performance enhancing mods (chips, exhaust, air intakes) I was happy with towing (small enclosed trailer with 3 dirt bikes) but I wish it had a bit more uummph in everyday driving. Also with the 2.5 leveling kit on the front what is the largest tire size that will fit with the stock 17 inch rims. I am not looking for some monster truck just want a little more power available and a little bit more of an aggressive look