BMW’s new M4 Coupe gets 520HP with Lightweight upgrades!
With 430-horsepower coming from the twin-turbocharged 3.0-liter engine, the new BMW M4 Coupe does have a lot of power crammed under the hood. A German tuning company called Lightweight however figured that the M4 could use a tad more power from what they got from the factory and had developed an upgrade kit that considerably …