BenzUnited Parts
C300 E300 GLC300 M274 Catless Downpipe + Stage 2 Tune Bundle | W205 W213 X253
C300 E300 GLC300 M274 Catless Downpipe + Stage 2 Tune Bundle | W205 W213 X253
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Off-road and competition use only in strict emissions areas. Professional install and dyno check advised. Gains vary by setup.
Everything your C300, E300, or GLC300 needs to go Stage 2+ — in one order.
Instant throttle response, real mid-range torque, turbo whoosh and pops, and no check-engine light.
Why buy it as a package?
Four parts that work together, with the calibration written around the exact hardware you're getting. The tune is matched to your downpipe, filter, and diverter valve from day one instead of paying for a re-flash later.
What's in the Bundle
| Item | What it does |
|---|---|
| Catless downpipe | T304 stainless, direct bolt-on — removes the biggest exhaust restriction |
| Custom remote ECU tune | No CEL, with 91 and 93 octane maps |
| K&N high-flow air filter | Washable, reusable drop-in — frees up intake airflow |
| GFB DV+ diverter valve | Faster, more consistent boost recovery between shifts |
| OBD2-to-USB flashing cable | Flash from home, no shop visit needed for the tune |
| Guides and ongoing support | Installation instructions plus help from the people who wrote the calibration |
What You'll Feel
- Up to 320 hp / 340 lb-ft at the crank
- Gains of +45–80 hp and +60–100 lb-ft over stock
- Sharper throttle response and noticeably faster spool
- Deeper exhaust note with low drone
- Optional pops and bangs on overrun
- Home flash in 30–60 minutes
Fitment
| Model | Chassis | Years | Engine |
|---|---|---|---|
| C300 | W205 | 2015–2021 | M274 2.0T |
| E300 | W213 | 2016–2021 | M274 2.0T |
| GLC300 / 4MATIC | X253 | 2016–2022 | M274 2.0T |
U.S.-spec M274 only — confirm your engine code and exhaust before ordering. Not sure? Send us your VIN and we'll confirm.
Frequently Asked Questions
How does the remote tune work?
You connect the included OBD2 cable and we walk you through the flash — typically 30–60 minutes at home, no shop visit needed for the calibration itself.
Will I get a check engine light?
No. The calibration is written to resolve the fault codes a catless downpipe would otherwise set — that's a large part of why the package exists.
What does the DV+ actually do?
The factory diverter valve uses a rubber diaphragm that softens over time. The GFB DV+ replaces the internals with a machined piston assembly, so boost recovers faster and more consistently between shifts — especially useful once the downpipe and tune raise boost.
Which octane maps are included?
Both 91 and 93. Higher octane lets us run more timing and boost safely, so gains are stronger on 93.
Does it fit 4MATIC?
Yes for the GLC300 4MATIC (X253). For C300 and E300, confirm your exact configuration with us before ordering.
Is there a warranty?
Yes — a 12-month structural warranty on the downpipe, with guaranteed fitment on every model listed above.
Buy With Confidence
- 12-month structural warranty with guaranteed fitment on listed models
- Free U.S. shipping with tracking
- Ongoing support — the calibration is ours, so help comes from the people who wrote it
- Fitment confirmed before you buy — send your VIN and we'll verify
Confirm fitment or ask a question →
BenzUnited Parts • M274 Stage 2+ Package • 12-Month Warranty • Ships Fast
