Hello Audi friends, I would like to ask which of you has done his 2.3 Ng already something performance-wise and if how? I would also be interested in how far your Ng turns? My 80 B4 2.3 quattro turns up to 5800 U/pm is normal? I am also looking for a sports exhaust system that doesn’t exactly cost the world. Thank you for your answers mfg Chris