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Catless Downpipes for Mercedes W222 C217 S550 - M278 4.7L V8 BiTurbo (2011–2017)

Catless Downpipes for Mercedes W222 C217 S550 - M278 4.7L V8 BiTurbo (2011–2017)

$849.00 USD
$849.00 USD
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Catless Downpipe Set
S550 • M278 BiTurbo V8 • 2011–2017

2011–2017 Mercedes-Benz S550 M278 Catless Downpipes
High-flow stainless downpipe set for M278 applications

Reduce exhaust restriction and improve turbo response with a catless downpipe set built for the 2011–2017 Mercedes-Benz S550 (M278 Bi-turbo V8, W222 sedan & C217 coupe chassis). Designed to increase exhaust flow for faster spool and stronger mid-range response—especially when paired with proper ECU calibration. Owners commonly report noticeably quicker turbo spool-up and improved throttle response after installation.

What’s Included
Complete left/right downpipe set (as pictured). Hardware/gaskets are not included unless shown in photos.
Engine
M278 Bi-Turbo V8
Chassis
S-Class (W222 sedan & C217 coupe)
Type
Catless / High-Flow

Why Upgrade the Factory Downpipes?

  • Improved exhaust flow: helps reduce backpressure for more efficient turbo operation.
  • Sharper response: faster spool and stronger mid-range pull.
  • More aggressive sound: increases exhaust volume and tone (varies by setup).
Recommended Next Step: ECU Tuning
A catless setup may trigger a check engine light without proper ECU calibration or sensor management.
View ECU Tune Options
If you have a different platform/tune listing for M278, link this button to that product instead.

Fitment

  • Mercedes-Benz S550 – 2011–2017 (W222 sedan & C217 coupe chassis)
  • Engine: M278 twin-turbo V8
Fitment tip: Please confirm your chassis code (W222 or C217) and engine (M278) before ordering. If you’re unsure, message us your VIN (optional) and we’ll help verify compatibility.

Important Use Notice

This product is intended for off-road or competition use only. Installation may not comply with local emissions regulations and may result in a check engine light without proper tuning.

Installation Notes

  • Professional installation recommended.
  • Inspect/replace gaskets and hardware as needed during installation.
  • Re-check for leaks after initial heat cycles.
Shipping & Returns
Fast shipping. 30-day returns accepted for unused and uninstalled items in original packaging. Installed/modified exhaust components are not eligible for return.
Need help confirming fitment?
Message us your VIN (optional) or confirm your year/model and engine (M278) and we’ll help verify before you order.
Contact Us

Frequently Asked Questions

Will these catless downpipes fit my 2011-2017 Mercedes S550 on W222 or C217 chassis?

Yes — these M278 catless downpipes are a direct fit for all 2011–2017 S550 models (W222 sedan & C217 coupe chassis) with the M278 bi-turbo 4.7L V8.

Do I need a tune with S550 M278 catless downpipes?

Highly recommended. A catless setup will usually trigger a check engine light without proper ECU tuning or O2 sensor spacers.

What performance gains can I expect from 2011-2017 S550 downpipes?

Noticeable improvement in turbo spool, throttle response, and mid-range torque when paired with tuning. Many owners report stronger acceleration and a more responsive feel.

Are these high-flow downpipes loud?

They produce a deeper, more aggressive exhaust note than stock catalytic converters. Sound level depends on your full exhaust setup.

Will these work on W222 S550 sedan and C217 S550 Coupe?

Yes. The downpipe set is designed for both the W222 sedan and C217 coupe chassis with the M278 engine.

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