Ya hor..didn't thought about big turbos and small turbos..my
bad..So that's why now got twin turbos where there are different
sizes ma..one smaller and one bigger..smaller one boost low revs,
bigger one kicks in at high revs..like BMW's 3.0-litre I6
twin-turbo? Correct me if wrong..
Golf GT's TwinCharger works in the same principle..except that it
has both a super- and turbocharger..
And Saab is underrated for a reason I guess..it's beautiful I
grant..and their turbocharged engines are a gem..but their interior
quality just can't match most continental cars leh even though Saab
is considered a conti car.. 
Edit: typo..