More Power?

[pdxhummerguy]

So what is the best way to go about getting more power out of my 6.5 engine? I have a 2002 ford excursion and recently added a product called the DP tuner and it's amazing the performance and mileage gains I have seen. It has made the ex a totally different vehicle. I was looking at predator and their raptorq system but haven't heard the best things about predators reputation over the years. i suppose starting with a new exhaust from rubber duck would be a good thing.