Enjoying 5 cylinder sound of an 1988 Audi 100 C3 2.0 RT

Enjoying 5 cylinder sound of an 1988 Audi 100 C3 2.0 RT while accelerating from 0-100km/h. De ignition is tuned to 95/98 octane petrol. De compression is higher then original because the cylinder head is cutted (1,2mm).