By this time, all Mustang owners (actually, any muscle car owner) should know that changing your cat-back doesn't add crap. Basically, you do it for the sound. Have you considered Borla as an option? I installed a Borla kit, and in my opinion, nothing comes close to the sound! A trained ear can distinguish Blowmasters from a higher quality exhaust and tuned note (Borla). I guarantee you will get compliments if you go with Borla. Plus, its 100% stainless steel. Most other manufacturers only coat the pipes with stainless steel. Or in the case with Flowmaster, it's just aluminized. Just food for thought. Later.