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BenzUnited Parts

M278 Intake Spacer Kit + aFe Magnum FLOW Pro 5R Filters (E550 / CLS550 / S550)

M278 Intake Spacer Kit + aFe Magnum FLOW Pro 5R Filters (E550 / CLS550 / S550)

$325.00 USD
$325.00 USD
Sale Sold out
Shipping calculated at checkout.
✅ Airbox Spacer (Left + Right)
Raises the filter sealing plane → smoother, higher-volume airflow into the MAF housing.
✅ aFe Magnum FLOW OE Replacement Air Filter w/ Pro 5R Media
Maximum-flow oiled cotton gauze (noticeably more airflow than Pro Dry S), reusable, perfect MAF compatibility.
✅ Factory Airbox Stays 100% Stock
Keeps perfect cold-air routing and heat shields — no heat-soak like open intakes.

Real-World Results Owners Report

  • Even crisper throttle tip-in and stronger mid-range pull
  • Maximum power consistency on hot days and repeated pulls
  • Zero check-engine lights • No ECU retune required

“Swapped to the Magnum FLOW OE w/ Pro 5R combo and the car feels a full step quicker.

What You Get

  • ✔ 2× Precision CNC-machined airbox spacers (left + right)
  • ✔ 2× aFe Magnum FLOW OE Replacement Air Filters w/ Pro 5R Media
  • ✔ All stainless hardware + install instructions

Fits These M278 4.7L BiTurbo Models

Model Chassis Years
E 550 • CLS 550 W212 / C218 2012–2016
S 550 / S 560 W222 • W221 2014–2017 (W222) / 2012–2013 (W221)
GL / GLS 450 • 550 X166 2013–2019
ML 450 • ML 550 W166 2012–2015

Install in ~20 minutes • No tools beyond a 10mm socket • Fully reversible

BenzUnited Parts • Mercedes Performance Specialists

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