Actually, you misunderstand. Flowmaster is a great muffler. Infact they are designed to increase horsepower greatly. Now what you are seeing inside is baffles, which you are correct, are for sound modification, other than that the exhaust is pretty empty which can be misleading. Flowmasters are designed for huge 350 (5.7 liter) engines which have a huge output from each exhaust pulse. these baffles make the air bounce around before they exit. Also they use inlet and outlet sizes of about 2.5 - 3 inches. Now you may say, wow thats big but on a 350 or 454 that actually can be pretty restrictive which keeps the torque up too.
Not to smash your dreams but thats the story.
<span style='font-family:Geneva'><span style='font-size:14pt;line-height:100%'><span style='color:red'>Fox</span></span> <span style='color:gray'>the Pirate</span>
Diplomacy is saying "nice doggy" until you find a rock.</span>
I live my life one quarter mile at a time, and for those 23 or more seconds I'm free.