This is a video showing you how to improve the sound of your 911 (997.1) Exhaust for under $10.00 with the Full Octane Exhaust Mod (AKA Fister and or Gundo Hack). As part of this video we have included a Porsche 911 Exhaust 101 along with a detailed explanation on how the Full Octane Mod (AKA Fister and or Gundo Hack) works. We have included step by step instructions, feel free to ask us any questions.