Noise differences between 2.2 TID and 2.2 TID?

Moin, Moin! Drive for a few days my 2.2 TID Arc (show car / 22 tkm Built. 6.04) and have previously driven a 9-3 Coupe (Bj. 4.02/ from 0 to 127 tkm). Was and am satisfied with the Maschiene totaly BUT in the Coupe I NEVER heard the turbocharger (?) whistles. In the Sport-Limo. you hear this whistling in the lower and middle speed range. Is this normaly? Find the engine otherwise perfect… Greeting to all SAAB drivers – and especially to those with the 2.2 solder engine 😉 Dirk