A custom tune from the likes of Bama Performance has notoriously yielded some of the lowest horsepower-for-dollar ratios of any modification you can buy for your Mustang. The 2015 Mustang tuners and custom tuning that's available today are no exception. The S550 may be a bit heavier than its S197 counterpart, but that difference can be made up quickly with a simple retune by the experts at Bama Performance.
These guys are great! Customer service is absolutely top notch. Their pricing points are spot on and every month they off some sort of special on multiple parts. Not only that but the staff will educate you on the parts and their customer reveiw option of every part has been a huge help in determining the validity of each part you buy. American Muscle is the perfect example of what a full service parts distributor and custom tuning shop should be. I'm just glad they are Mustang exclusive!