Mercedes-Benz AMG GT / GTC / GTS / GTR / GTR Pro Catless Downpipes — M178 4.0L Twin-Turbo V8
YPG Motorsport catless downpipes for the Mercedes-AMG GT family replace the factory catalytic converters with full 3.5-inch mandrel-bent stainless steel pipes. The M178 dry-sump V8 responds immediately — faster spool, sharper throttle response, reduced exhaust gas temperatures, and the raw, aggressive V8 note the GT was engineered to deliver.
When paired with a Stage 2 ECU calibration, power gains depend on variant: the AMG GT S moves from 522 HP to 650+ HP, and the GTR pushes well past 700 HP. For Stage 3+ turbo builds on the M178, downpipes are a mandatory prerequisite — the factory cats are the single biggest restriction in the exhaust path.
Compatibility
- Mercedes-AMG GT (C190 / R190) — 462 HP base
- Mercedes-AMG GT S — 522 HP
- Mercedes-AMG GT C — 550 HP
- Mercedes-AMG GT R — 577 HP
- Mercedes-AMG GT R Pro — 577 HP
- M178 4.0L Twin-Turbo V8 (dry sump) — all model years
Key Specifications
- Diameter: 3.5 inches — full mandrel bent
- Material: Low-carbon 304 stainless steel
- Construction: TIG welded, hand finished
- Flanges: CNC-machined 304 stainless — laser-cut OEM mounting points
- Fitment: Direct OEM replacement — bolt-on, no fabrication required
- Origin: Made in Germany
- Warranty: Lifetime
What's Included
- 1× pair stainless steel catless downpipes
- All necessary bolts, gaskets, and clamps
- OEM-style mount points for factory exhaust retention
Installation
Professional installation recommended. Requires vehicle lift access. Installation time is approximately 2–3 hours depending on model variant. A Stage 2 ECU calibration is required to eliminate the CEL and unlock the full performance potential. YPG Motorsport offers remote ECU flashing worldwide — OBD2 tool shipped to your door, guided session, 30–45 minutes, fully reversible to stock.
Why YPG Motorsport
YPG Motorsport has been building and tuning AMG engines since 2011. The M178 shares its core architecture with the M177 — the same engine family we used to set the world record for the first sub-10-second W205 C63 quarter mile. We know this platform inside and out. Ships worldwide with free delivery. GCC stock available for same-week dispatch to Kuwait, Saudi Arabia, UAE, Qatar, Bahrain, and Oman.