I don't think the engine changed between those model years but the specs changed:
2010
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Max power output: 281 hp at 5600 rpm
Max torque: 295 ft./lbs. at 1500-4800 rpm


2011
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Max power output: 300 hp at 5600 rpm
Max torque: 325 ft./lbs. at 1500-4800 rpm


I checked with Polestar and they don't offer anything for S80 T6. Is there a software upgrade from Volvo for 2010 S80 T6's for performance?
Thanks

 

Polestar is the software from Volvo. We don't have anything else.

 

Can the 2011 regular Volvo software be applied to a 2010 S80 T6?

 

Not sure. But if Polestar doesn't have a software for it, then no