Mercedes-AMG C63 W205 Downpipes — Catless, 200-Cell & 400-Cell | M177 4.0L Twin-Turbo V8 | 2015–2021
YPG Motorsport race downpipes for the Mercedes-AMG C63 and C63 S (W205) replace the restrictive factory catalytic converters with full 3.5-inch mandrel-bent 304 stainless steel pipes. Reduced backpressure, faster turbo spool, sharper throttle response, and a dramatically deeper, more aggressive V8 exhaust note with pronounced burbles and crackles on overrun.
The W205 C63 is the car that made YPG Motorsport's name. Our C63 holds the world record for the first sub-10-second M177 quarter mile — 9.97 seconds at 828 WHP, set at Beech Bend Raceway Park, Kentucky on April 9, 2019. These are the same downpipes we run on our own builds.
Watch: C63 W205 — Stock vs YPG Tuned Sound Comparison
Hear the difference. Stock C63 W205 vs YPG Stage 2 with catless downpipes — back-to-back sound comparison on the same car.
Watch: C63 W205 with YPG Downpipes
Power Gains with Stage 2 ECU Calibration
When paired with a YPG Stage 2 ECU calibration, the W205 C63 S produces approximately 660–700 HP and 700–750 lb-ft of torque — a gain of +150–190 HP over stock. At these power levels, the C63 S runs consistent mid-to-low 10-second quarter miles on street tyres.
A Stage 2 ECU tune is mandatory to unlock the full benefit and eliminate the check engine light caused by rear O2 sensor deletion. YPG offers remote OBD flashing worldwide.
Catless vs 200-Cell vs 400-Cell — Which Should You Choose?
Catless downpipes ($1,499.99) — Zero restriction. Maximum flow, maximum power, loudest exhaust note. This is what the world record C63 runs. Best for: track cars, drag cars, roll race builds.
200-cell high-flow catted ($2,499.99) — Ultra-high-performance 200cpsi sport catalysts. Within 5–10 HP of catless while substantially reducing exhaust smell. Best for: daily drivers who want performance without the cabin odor.
400-cell GESI high-flow catted ($3,599) — GESI GEN2 400cpsi catalytic converters rated for 1,000+ HP. Closest to emissions compliance while still delivering serious flow improvements over stock. Best for: street builds prioritizing compliance alongside performance.
| Feature | Catless | 200-Cell | 400-Cell GESI |
|---|---|---|---|
| Flow | Maximum | Near-catless | High-flow, stock+ |
| Exhaust Smell | Noticeable | Minimal | Near-stock |
| Sound | Loudest | Deep, refined | Enhanced, refined |
| Daily Friendly | Track-focused | Yes | Yes |
| Price | $1,499.99 | $2,499.99 | $3,599 |
Vehicle Compatibility — All W205 C63 Body Styles
- 2015–2021 Mercedes-AMG C63 W205 Sedan
- 2015–2021 Mercedes-AMG C63 S W205 Sedan
- 2015–2021 Mercedes-AMG C63 S205 Estate / Wagon
- 2015–2021 Mercedes-AMG C63 C205 Coupe
- 2015–2021 Mercedes-AMG C63 A205 Cabriolet
- Pre-facelift and Facelift models
- M177 4.0L Twin-Turbo V8 — all variants
Key Specifications
- Diameter: 3.5 inches — full mandrel bent
- Material: Low-carbon 304 stainless steel
- Construction: TIG welded, back-purged, hand finished
- Flanges: CNC-machined 304 stainless
- Fitment: Direct OEM replacement — bolt-on
- Origin: Made in Germany
- Warranty: Lifetime
Installation
Professional installation recommended. 2–3 hours on a vehicle lift. Bolt-on replacement — no cutting, welding, or fabrication. Compatible with factory and aftermarket cat-back exhaust systems. Stage 2 ECU calibration required. YPG offers remote flashing worldwide.
Why YPG Motorsport
The W205 C63 is our signature platform. Our C63 ran 9.97 seconds at 828 WHP at Beech Bend Raceway Park, Kentucky — the first M177-powered C63 in history to break 10 seconds. Since 2011.
Free worldwide shipping. GCC stock for same-week dispatch to Kuwait, UAE, Saudi Arabia, Qatar, Bahrain, and Oman.
Frequently Asked Questions
How much HP do C63 W205 downpipes add?
20–40 HP standalone. With Stage 2 tune: 660–700 HP total on the C63 S.
Do I need a tune with downpipes?
Yes. Stage 2 ECU calibration is mandatory.
Will these fit the C63 Coupe, Wagon, and Cabriolet?
Yes. Same fitment across all W205 C63 body styles.
Catless vs 200-cell vs 400-cell — which is better?
Catless for max power and track use. 200-cell for daily driving without the smell. 400-cell GESI for the closest to emissions compliance with strong flow gains.
How much do C63 W205 downpipes cost?
Catless: $1,499.99. 200-cell: $2,499.99. 400-cell GESI: $3,599. Free worldwide shipping. Lifetime warranty.
These downpipes are the hardware prerequisite for Stage 2 power. Pair them with the matching ECU tune to extract the full gains.
View Stage 2 Tune →
