Anyone have hard numbers for exhaust comparisons?

I see alot of flowmaster sucks or Hooker is best, really though has anyone got ant real numbers?

I have a Flowmaster and I love it and felt a SOTP difference after installing it.

 

I put the same thing over at fbody.com and nobody has any numbers. I have a flow catback and got 287 at the dyno with just that and CAI, HPP3. I think it is just a "nothing that has been around awhile" thing, and I did a google search with no luck.