Hallo!

Yeah, I have heard the same but I have ordered one chip for my engine to try it out myself.
One Norweigan guy at the Nordic Audi forum reported that he was satisfyed with the ECU chip change on his 3.6 automatic he claimed that the gearchanges was affected in a positive manor as well.
And yes the exhaustsystem is very restrictive on the V8.
I have changed the last muffler to a less restrictive unit and I have removed the lid over the intake for more air. And sound!

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Audi V8 4.2 (Panther Schwarz 92)