that audi back boxes are pants !!
Restriction inside Audi muffler - YouTube
ok its from an a6 but looks the same to me
Restriction inside Audi muffler - YouTube
ok its from an a6 but looks the same to me
Turbocharged engines have specifically tuned exhausts in order to retain certain back pressure and allow the turbo to have a transient response, by removing the "restrictions" you modify the exhaust path in a big way and the response changes accordingly !