The Exhaustsytems from BN-Pipes and FOX are made of stainless steel and
passed the noise emission test in Germany,
but i do not know if the German permission is also true for Switzerland.

I replaced the factory exhaust from my 88 V8 4 years ago,
because i bought for a good price a FOX exhaust with 4 tailpipes,

if i had not bought the FOX i would still run the factory exhaust.

Gude Mario Audi 100 CD Autom. Bj.83 Audi 200 20v Bj.89 Audi 5000 Bj.85 Audi V8 3,6 Autom. Bj.88