BenzUnited Parts
M178 Catless Downpipes – Mercedes-AMG GT / GT S / GT C / GT R (R190) 4.0L V8 BiTurbo
M178 Catless Downpipes – Mercedes-AMG GT / GT S / GT C / GT R (R190) 4.0L V8 BiTurbo
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Off-road and race use only. Not legal for street use or emissions-controlled vehicles. Buyer is responsible for compliance with local laws.
For the discerning AMG GT owner who values sophistication and real performance. These high-flow stainless steel catless downpipes are purpose-built for the M178 BiTurbo V8 to deliver improved exhaust flow, quicker turbo response, and a deeper, more composed AMG exhaust note — while preserving the refined character expected of a flagship Mercedes performance car.
Real M178 Exhaust Sound
Key Features & Benefits
- Reduced Exhaust Backpressure — Allows the turbos to spool more efficiently and build boost faster under load
- Quicker Turbo Response — Sharper throttle feel with more immediate power delivery
- Refined AMG Sound — Deeper, more composed tone that maintains sophistication at cruise
- 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
Pair With Tuning
Downpipes are the hardware half of the equation. Tuning is what turns them loose — it lets the ECU take advantage of the extra flow, and it addresses the fault codes the catless design will otherwise set on a stock car.
Compatibility
| Chassis | Years | Models |
|---|---|---|
| R190 | 2015–2023 | AMG GT |
| R190 | 2015–2023 | AMG GT S |
| R190 | 2016–2023 | AMG GT R |
| R190 | 2018–2023 | AMG GT C |
If your car is on that list, these bolt straight on with no cutting or fabrication.
Frequently Asked Questions
Do these require a tune?
They work well on stock vehicles. Tuning is highly recommended for maximum performance and to address fault codes.
Will I get a check engine light?
Likely, on a stock car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. Tuning resolves it properly — we do not recommend defeat devices.
Are they catless?
Yes — fully catless. Intended for off-road, track, and racing use only.
Will they fit my exact vehicle?
These fit the R190 AMG GT and GT S (2015–2023), GT R (2016–2023), and GT C (2018–2023) — all with the M178 4.0L BiTurbo V8. If your car is on that list, it bolts straight on with no cutting. Not sure? Send us your VIN and we will confirm before you order.
How long does installation take?
Professional shops typically complete the install in 2–3 hours.
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 every order
- 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 M178 inside out
- Real support — questions before or after purchase go straight to us, not a call center
Confirm fitment or ask a question →
BenzUnited Parts • Premium M178 Downpipes • 12-Month Warranty • Ships Fast
For off-road and racing use only. Not legal for street use or emissions-controlled vehicles.
