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From what I can tell via google the Saab 9-5 used an asymmetrical turbo design. The used a Garret G17 turbo hooked up to one bank of cylinders on their V6 (which is actually a GM sourced engine) that fed the intake thus turbocharging the engine. The G17 is a very lightweight (by design standards of the day) turbo that didn't take much exhaust to spool up.
The design in general was all about getting low end power and torque in an economical sense. Saab saved money by using a small turbo and got the power they were looking for.
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E90 335i, Sparkling Graphite, Black Dakota leather, Burlwood trim, 6MT, ZSP, ZPP, PDC, Comfort access, heated seats, Navi w/iDrive, Production finished 10/6, Delivered 11/22/06.
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