gibson cat back exhaust system

Performance Exhaust on a 02 Mustang gt V8 4.6?
should I go with a Magnaflow Magnapacks Cat-Back Exhaust or “GIBSON AMERICAN MUSCLE CAR EXHAUST, ALUMINIZED or a FLOWMASTER FORCE II EXHAUST SYSTEM KIT, ALUMINIZED STEEL looking for a extremly loud and all the performance I can get thanks Lee
You’ll get loud, but you won’t get performance.
Search Google for dyno results of such things. A best, you may see 5-7 wheel horsepower. Which ultimately, will make you think like you’ve gained a lot, because it sounds louder, but it really won’t change your performance much at all.
hemi borla cat back exhaust part 1