This Mercedes-AMG CLS 53 just got a major performance boost with a full exhaust system upgrade, featuring a Veleno catback exhaust, high-flow catted downpipe, and EM Stage 2 ECU tuning. The result? A significantly more aggressive exhaust note and noticeably sharper throttle response. On the dyno, power surged from 383whp and 519Nm to an impressive 466whp and 601Nm — a gain of +83whp and +82Nm. Sleek, stealthy, and seriously fast, this AMG CLS53 now embodies the perfect sleeper setup with serious bite.