BenzUnited Parts
M177 Catless Downpipes for Mercedes-AMG GT 63 (X290) & E63 / E63S (W213) – 304 Stainless Steel
M177 Catless Downpipes for Mercedes-AMG GT 63 (X290) & E63 / E63S (W213) – 304 Stainless Steel
Couldn't load pickup availability
Off-road, track, and racing use only. Not legal for highway use in emissions-restricted areas.
These 304 stainless steel catless downpipes replace the restrictive factory catalytic converters on the M177 4.0L BiTurbo V8. They significantly improve exhaust flow, enable faster turbo spool, and deliver sharper throttle response while maintaining excellent build quality.
Choose Your Setup
Two options above let you build exactly the package you want:
| Configuration | Price | Best for |
|---|---|---|
| Downpipes only | $649 | You already have tuning lined up |
| + Heat shielding | $749 | Daily-driven or hot-climate cars |
| + Custom ECU tune | $2,895 | Complete Stage 2, one order |
| + Both | $2,995 | The full package |
Why bundle the tune? Run catless without one and you'll likely set a check-engine light and leave most of the potential power unclaimed. Selecting it here means the calibration is built around these exact downpipes from day one — and it costs less than buying the downpipes and a standalone tune separately.
Prefer shielding as standard? The heat-shielded listing → covers the same fitment with thermal shields fitted as standard.
Real M177 Exhaust Sound
With tune + these downpipes
Downpipes only (stock tune)
Key Features & Benefits
- Reduced Exhaust Backpressure — Allows the turbos to spool more efficiently and build boost faster under load
- Precision TIG Welds & Machined Flanges — Creates strong, leak-free connections with exact factory fitment
- Bolt-on V-Band Design — Simple installation in 2–3 hours with no cutting or modifications required
- Heavy-Wall 304 Stainless Steel — High-quality material selected for heat resistance and long-term durability
Compatibility
| Chassis | Years | Models |
|---|---|---|
| X290 | 2019–2023 | AMG GT 63 4-Door Coupe |
| X290 | 2019–2023 | AMG GT 63 S 4-Door Coupe |
| W213 | 2017–2023 | E63 AMG S |
| W213 | 2016–2020 | E63 AMG |
The engine code decides fitment, not the badge. If your car is on that list, these bolt straight on with no cutting.
Frequently Asked Questions
Do these require a tune?
They'll run on a stock car, but a tune is strongly recommended — both to get the full benefit and to clear the fault codes that catless pipes typically set. You can add it directly above. There's a sound clip of both configurations so you can hear the difference.
Will I get a check engine light?
Likely, on the stock tune. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A tune resolves it properly — we do not recommend defeat devices.
Is the heat shielding worth it?
On a daily-driven car, in a hot climate, or on a tuned setup — yes. It keeps heat in the exhaust stream for quicker spool and drops radiant heat soak into surrounding wiring and sensors. On a dedicated track car with other cooling upgrades, the standard version is usually enough.
Are these street legal?
No — fully catless, intended for off-road, track, and racing use only. Not emissions-compliant for street use in most areas.
How do I know they fit my car?
These fit the M177 BiTurbo V8 in the AMG GT 63 and GT 63 S (X290, 2019–2023), E63 AMG (W213, 2016–2020), and E63 AMG S (W213, 2017–2023). The engine code decides fitment, not the badge. Unsure? Send your year, model, and VIN and we'll confirm before you order.
How long does installation take?
2–3 hours at a professional shop. It's a bolt-on V-band design — no cutting or modification required.
What's included?
A pair of 304 stainless steel catless downpipes with machined flanges and V-band clamps. Message us if you need to confirm gaskets or hardware for your specific chassis.
Is there a warranty?
Yes — a 12-month structural warranty, 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 on all orders
- Fitment confirmed before you buy — send your VIN and we'll verify before you order
- Mercedes-AMG specialists — we focus exclusively on Mercedes platforms and know the M177 inside out
- Real support — questions before or after purchase go straight to us, not a call center
Confirm fitment or ask a question →
Premium-Quality M177 Downpipes • 12-Month Warranty • Ships Fast • 30-Day Returns
For off-road, track, and racing use only. Not legal for highway use in emissions-restricted areas.
