muffler flow numbers comparison

This ? Comparo or a bunch o mufflers , flow , noise ?
Had cherry bombs when car was bought , now have dynomax super turbo , car pulls well , don't see a difference , but the car is quiet cruising , nice sound when it opens up
http://ls1tech.com/forums/ls1-domestic-forums/t-119518.html

another site testing dif mufflers results
http://www.stevesnovasite.com/forums/archive/index.php/t-111009.html

http://exhaustsoundclips.com/cfm.pdf