A Polestar ECU upgrade increases the desirability of the Volvo S60 saloon – but is it too little too late?The original S60 T6 AWD we drove back in 2010 was a car of two halves. The smooth ride, uncompromising interior quality and comfortable seating dao this saloon a major thumbs up, but the lack of performance and overall metal for the price was a definite sore point. Volvo has at least tried to rectify one of those problems by offering customers a Polestar ECU upgrade. At 660 its not cheap, but Volvo kaže tinkering with the cars internal software can increase horsepower from 304hp to 325hp and boost torque to 355lb ft. A Polestar ECU upgrade increases the desirability of the Volvo S60 saloon – but is it too little too late?The original S60 T6 AWD we drove back in 2010 was a car of two halves. The smooth ride, uncompromising interior quality and comfortable seating gave this saloon a major thumbs up, but the lack of performance and overall metal for the price was a definite sore point. Volvo has at least tried to rectify one of those problems by offering customers a Polestar ECU upgrade. At 660 its not cheap, but Volvo says tinkering with the cars internal software can increase horsepower from 304hp to 325hp and boost torque to 355lb ft.