Servus colleagues, I have a question about my Audi Coupe 5 cylinder year 1986. How can I am able to amplify the 5 cylinder sound? A buddy of mine meant that the Quattro is even louder. It comes from another air filter box or something. Who can help me further what can be changed? Or are there other means, open sports filter??? or exhaust system (group A)??? The five cylinder sound is simply addictive!!!