• 2 Piece Billet Aluminum Pulley Set for Mercedes-Benz M278 engines – CNC machined performance upgrade
  • Installed M278 Billet Pulley Set on Mercedes-Benz E550 engine bay showing precise CNC fitment
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BenzUnited Parts

M278 2-Piece Billet Aluminum Pulley Set – E550 / CLS550 / S550

M278 2-Piece Billet Aluminum Pulley Set – E550 / CLS550 / S550

$230.00 USD
$230.00 USD
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Shipping calculated at checkout.

Precision billet upgrade that reduces belt slip, eliminates noise, and gives smoother, sharper response on every tuned or hard-driven M278.

Why This Billet Pulley Set Makes a Real Difference on the M278

✅ Aerospace Billet Aluminum + Hard Anodized
CNC-machined for zero flex and maximum strength under boost.
✅ Premium Nachi ZZ Bearings
Ultra-quiet, high-speed bearings that eliminate belt chirp and last for years.
✅ Perfect Bolt-On Fit
Direct replacement using factory brackets — no modifications, installs in under 60 minutes.

Real-World Results Owners Report

  • Smoother revs and noticeably sharper throttle response
  • Eliminated belt squeal and improved belt tracking under load
  • Better consistency when the turbos are spooled on tuned cars
  • Zero vibration even at redline • Made in USA quality you can feel

“The difference in smoothness and belt noise is night and day on my tuned E550. These pulleys are the first thing I recommend after downpipes.” – Alex R., 2015 CLS550 • 512 whp

What You Get (Complete 2-Piece Kit)

  • ✔ 2 × Precision CNC Billet Aluminum Pulleys (hard anodized)
  • ✔ High-Speed Nachi ZZ Bearings pre-installed
  • ✔ All necessary stainless hardware + install guide

Fits These M278 4.7L BiTurbo Models

Model Chassis Years
E 550 • CLS 550 W212 / C218 2012–2016 / 2012–2018
S 550 • CL 550 W221 • W222 • C216 2011–2017
SL 550 R231 2013–2018
GL / GLS 550 • ML / GLE 550 X166 • W166 2012–2019

✅ Confirmed for all M278 4.7L BiTurbo engines • Message if unsure

Install in under 60 minutes • Bolt-on using factory brackets • No cutting or mods

🔥 Add Pulley Set to Cart – Ships Same Day

BenzUnited Parts • Mercedes Performance Specialist • Burbank, CA

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