Has anyone really even done tests on any of the most popular ones? Flowmaster, Magnaflow, Dynomax and SLP

Alot of people lately have been running Flowmaster through the mud but I haven't seen anything more than he said she said.

And comparing a Crossflow to a Loudmouth is like apples to oranges, It is quite obvious that the LM will out flow a Crossflow.

How does a Magnaflow out flow a Flowmaster? The Magnaflows have a c shaped baffle 1 inch from the inlet to force un-muffled exhaust out the right tailpipe.