We all know Audi exhausts tend to come with some dents to fit.
Randomly came across this video tested how much difference it makes.
http://vid.carbuzz.com/the-lesson-here- ... m_source=3
Dented exhaust sections - does it matter?
Re: Dented exhaust sections - does it matter?
I saw that, interesting test and quite surprising! 
2003 C5 RS6 Avant Daytona Grey
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