• K&N 33-2474 high-flow red air filters professionally installed into precision CNC airbox spacers – M278 intake upgrade combo for Mercedes-Benz E550 CLS550 S550
  • M278 K&N 33-2474 Air Filters + Airbox Spacer Kit – Complete set with stainless steel spacers, screws and bushings for Mercedes E550 CLS550 S550 GL550
  • Premium studio view of K&N 33-2474 filters with full airbox spacer kit including hardware – High performance intake upgrade for Mercedes M278 4.7L V8 engines
  • K&N 33-2474 air filter set in original red packaging – Genuine K&N Million Mile Warranty filters for Mercedes-Benz M278 engines
  • Angled view of K&N 33-2474 red pleated high-flow air filters – Pair for Mercedes M278 E550 CLS550 S550 – Washable & reusable
  • K&N 33-2474 Performance Air Filters Pair for Mercedes M278 4.7L V8 – E550 CLS550 S550 GL550 – Drop-in high flow replacement filters
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BenzUnited Parts

M278 Mercedes Intake Spacer Kit + Set of K&N Drop-in Performance Air Filters (4.7L V8 Bi-Turbo)

M278 Mercedes Intake Spacer Kit + Set of K&N Drop-in Performance Air Filters (4.7L V8 Bi-Turbo)

$285.00 USD
$285.00 USD
Sale Sold out
Shipping calculated at checkout.

The ultimate OEM+ intake upgrade — K&N high-flow filters + precision airbox spacers for maximum throttle sharpness and mid-range power.

Why This K&N + Spacer Combo Crushes It on the M278

✅ Airbox Spacers (Left + Right)
Raises the filter sealing plane for smoother, higher-volume airflow into the MAF housing.
✅ K&N 33-2474 Performance Filters
Legendary oiled cotton media + Million Mile Warranty® — proven HP gains, washable, CARB legal, no tuning needed.
✅ Factory Airbox Retained
Keeps perfect cold-air routing & heat shields — zero heat-soak, zero MAF issues.

Real-World Results Owners Report

  • Crispier throttle tip-in and noticeably stronger mid-range pull
  • Better power consistency on hot days and repeated pulls
  • Perfect headroom for headers, downpipes, tune, or E85
  • Zero check-engine lights • Fully reversible • No ECU retune

“K&N filters + spacers on my E550 with downpipes = night and day difference. Throttle is razor sharp and it pulls way harder now.” – Alex R., 2015 CLS550 • 512 whp

What You Get (Full Combo Kit)

  • ✔ 2 × Precision CNC-machined airbox spacers (left + right)
  • ✔ 2 × K&N 33-2474 High-Flow Performance Air Filters (pre-oiled)

Fits These M278 4.7L BiTurbo V8 Models

Model Chassis Years
E 550 • CLS 550 W212 / C218 2012–2016
S 550 / S 560 • CL 550 W221 • W222 • C216 • C217 • A217 2011–2017
SL 550 R231 2013–2020
GL / GLS 450 • 550 • ML / GLE 550 X166 • W166 2012–2019

✅ Always verify M278 engine code • Message me if unsure

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

🔥 Add Combo Kit to Cart – Ships Same Day

BenzUnited Parts • Mercedes Performance Specialist • Burbank, CA

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