Are these figures ALL for 2 1/2?? [/quote]

No - 2.5" & 3" combined I guarantee you. This list should have been separated by the different size mufflers. [/quote]

lol, went and looked at some part numbers, some of them are 4"-5" - im not too sure some of the bigger ones are accurate either 2200cfm seems a bit more than what a bare 4" pipe would flow?