Aston Martin Launches Performance Upgrades for 4.3 V8 VantageFollowing the introduction of the new Aston Martin 4.7 V8 Vantage this summer, Aston Martin is now offering owners of the previous 4.3-liter V8 Vantage the choice of a retrospective-fit power enhancement along with a new Sports Pack option. Available through the company's dealer network, the power upgrade is realized through a revised