30's are one chamber, 40's are the originals (2 chamber), 50's are the quieter version of the 40's(still 2 chamber i believe), & 60's are for the ricers.
any series followed by delta is supposed to have less interior resonance aka drone.
this is just my 2 pennies, more than u care to read about em @
http://www.flowmastermufflers.com/cgi-bin/flowmaster/mufflers.html?id=WZ8C2E2y
any series followed by delta is supposed to have less interior resonance aka drone.
this is just my 2 pennies, more than u care to read about em @
http://www.flowmastermufflers.com/cgi-bin/flowmaster/mufflers.html?id=WZ8C2E2y