I have changed my mind and desided to go with the Super 40 Series Muffler. I spoke to the master mechanic again and said not to go with the Original 40 Series but to go with the Super 40 Series with Delta Flow. The Super 40 Series has a the same of both worlds Sound and Performance. Plus it has the least amount of interior resistence which is good in my case. I want the loudness now. HAHAHA