There are different videos out there comparing different brands. But often they may not be apple-to-apples testing since some changes may have been made. Like adding a X-pipe with the change. Or going from 2-1/2" exhaust to 3" with the change.
Here is one Flowmaster vs Dynomax video........
https://www.youtube.com/watch?v=0o3QTdNYLBw
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE