Once you've got your 2005-2009 Mustang as customized as you need it to really make it stand out in a crowd, you should also be thinking about including a Mustang Battery to be able ot handle that souped up ignition system. Fortunately, AmericanMuscle has all the performance Mustang batteries you could ask for that would be perfect for your S197 Mustang. We also carry a full line of performance Mustang Starters and Mustang Coils and Coil Packs that will really let you get the most out of your ignition system.