Welcome! For the Ecoboost SHO the most bang for the buck is going to be a solid tune. Exhaust tends to be more for noise, and the intake systems are a bit of a holy war as far as benefits. For most applications people are seeing the KN drop in filter as the best investment. Although the other intake systems, much like the exhaust systems, make for some pretty cool noises. I had coilovers on my 2010 and HR's on my 2016 performance package. The HRs stiffened things up a bit and certainly impacted the smooth ride, but that is going to be subjective. I personally didn't have an issue with it, but there have been some who are more interested in the smoother ride.