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The Aero engine will fit but it is only a 2.0 litre so is a bit smaller/different than the 2.3 litre. Although both are T7 engines. Best bet is to try to find a 2.3 litre T7 recoed or secondhand engine rather than fit the 9-3 Aero engine IMO.

If you do fit the Aero engine you can easily get the output with stock internals to 300hp (like I have on my 2002 9-3 Aero) with a tune and changed hardware, making it output more than a stock Viggen.
 

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Will fit but not the same effect - you can match and exceed the HP numbers with tuning but you won't get the torque delivery and that's what makes the 2.3 special.
 
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