As AMG is to Mercedes, Polestar is to Volvo. Why haven't we heard much about the partnership? Good question, we don't know.

What we do know is that Polestar has completely reworked the standard S60 and pushed the sedan to a 0-62 of under 4 seconds and a top speed of 186 mph. What does that mean? Well, 508 hp under the hood and a true Swedish rival to BMW's M5. 

The car will debut in L.A. next week.

[via Autocar]