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K&N Performance Air Filter Set for Mercedes E550 / CLS550 / S550 (4.7L V8 Bi-Turbo)
K&N Performance Air Filter Set for Mercedes E550 / CLS550 / S550 (4.7L V8 Bi-Turbo)
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K&N Performance Air Filters – Pair (Mfg Part # 33-2474)
The legendary red K&N drop-in filters trusted by tuned M278 owners for over a decade — instant throttle sharpness and proven horsepower gains with zero hassle.
Why K&N Performance Filters Are Perfect for Your M278
High-flow oiled cotton media delivers measurable gains in throttle response and mid-range power.
Clean and re-oil every 50,000 miles — backed by K&N’s famous Million Mile Limited Warranty®.
Perfect factory seal, works with stock MAF & electronics, CARB legal in all 50 states, will NOT void your warranty.
Real-World Results Owners Report
- Noticeably crisper throttle and stronger mid-range pull
- Better power delivery on hot days and repeated runs
- Perfect match for headers, downpipes, tune, E85 or spacers
- Zero check-engine lights • No tuning required
“Put the K&N pair in my E550 last week — throttle is way sharper and it pulls harder through the gears. Exactly what I expected from K&N.” – Alex R., 2015 CLS550 • 512 whp
What You Get (Sold as Pair)
- ✔ 2 × K&N High-Flow Performance Air Filters (Left + Right) – Part # 33-2474
- ✔ Pre-oiled and ready to install
- ✔ Installation instructions
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 |
OE Cross Reference: 2780940004 • 278094000495 • 278094000490 • Always confirm M278 engine code
Frequently Asked Questions
Will these void my factory warranty?
No. They're a drop-in replacement that works with the stock MAF and electronics, and they're CARB legal in all 50 states.
Do I need a tune?
No tuning required, and no check engine lights. They run on the stock tune as a direct replacement for the factory filters.
How often do they need cleaning?
Clean and re-oil roughly every 50,000 miles. They're washable and reusable rather than disposable, and carry K&N's Million Mile Limited Warranty.
Am I getting one filter or two?
Two — this is sold as a pair (left and right), since the M278 uses two filters. They arrive pre-oiled with installation instructions.
How long does the install take?
Under 5 minutes, no tools required, and fully reversible — they drop straight into the factory airboxes.
How do I confirm these fit my car?
Confirm your car has the M278 4.7L biturbo V8 — the engine code decides fitment, not the badge. Covered chassis are in the table above, and OE cross references are 2780940004 / 278094000495 / 278094000490. If you're unsure, message us your year, model, and VIN.
Drop-in install in under 5 minutes • No tools needed • Fully reversible
BenzUnited Parts • Mercedes Performance Specialist • Ships from USA
