This 540i Sport Line is tuned and tightened: Pro Tuning Freaks’ engine tune and X-PH cold air intake give stronger response, while ST coilovers drop and sharpen the chassis. Spool Performance downpipes hint at a livelier midrange and the BayOptiks LCI clear taillights plus AKA Motorsports aero pieces tidy the visuals. It’s a balanced package for someone who wants their daily to handle better and sound a touch more assertive without losing that grown-up sedan vibe 🧲.