M278 Catless Downpipes for Mercedes E550 / CLS550 (W212 / C218) 2011–2017

Upgrade your Mercedes M278 BiTurbo V8 with these high-flow catless downpipes. Designed for the 2011–2017 E550 (W212) and CLS550 (C218), they significantly reduce exhaust restriction for faster turbo spool, improved throttle response, and a deeper, more aggressive exhaust note.

Key Benefits

• High-flow catless design — Reduces backpressure at the turbo outlets for quicker boost response and stronger mid-range power.
• Direct bolt-on fitment — No cutting or modifications required. Replaces factory catalytic converters.
• Refined AMG exhaust sound — Deeper, more aggressive tone under load with minimal drone during cruising.
• Improved turbo spool & throttle feel — Noticeable gains in responsiveness when paired with proper ECU tuning.

Vehicle Compatibility

What’s Included

Complete left + right downpipe set (as pictured). Hardware and gaskets not included unless shown.

Installation Notes

Direct bolt-on replacement. Average install time: 1.5–2.5 hours. Professional installation recommended. Re-check for leaks after initial heat cycles.

Recommended: ECU Tuning

A catless setup often triggers a check engine light. We highly recommend pairing these downpipes with custom ECU tuning for optimal performance and to clear codes.

Shop M278 ECU Tuning Options →

Important Use Notice

Frequently Asked Questions

• Will these fit my 2011–2017 E550 or CLS550? Yes — direct fit for W212 E550 and C218 CLS550 with the M278 BiTurbo V8.
• Do I need a tune? Highly recommended. Most owners add ECU tuning to avoid check engine lights and maximize performance gains.
• What performance gains can I expect? Faster turbo spool, sharper throttle response, and stronger mid-range torque when paired with tuning.
• Will they work with aftermarket exhausts? Yes — designed to work with both factory and aftermarket mid-pipes.