AMG M178 Crate Engine | AMG GT Buyer's Guide
The Mercedes-AMG M178 is the dry-sump, flat-plane-crank variant of AMG's 4.0-liter twin-turbo V8 — built exclusively for the AMG GT family (C190/R190). Unlike the M177 found in the C63, E63, and G63, the M178 uses a flat-plane crankshaft for sharper throttle response and higher-RPM power delivery, plus a dry-sump oil system that keeps the engine fed under sustained lateral G-forces on track.
For owners building a high-power AMG GT, replacing or upgrading the long block is the foundation of any serious project. This guide covers everything you need to know about the YPG M178 crate engine: what you get, how it compares to rebuilding, compatible upgrades, and total build cost planning.
M178 vs M177 — What Makes the AMG GT Engine Different
The M178 and M177 share the same 4.0-liter displacement and twin-turbo architecture, but the M178 is a fundamentally different engine built for a different purpose. Understanding the differences matters when planning a build:
| Specification | M178 (AMG GT) | M177 (C63/E63/G63) |
|---|---|---|
| Crankshaft | Flat-plane | Cross-plane |
| Oil System | Dry sump | Wet sump |
| Factory Output | 469–630 HP (variant dependent) | 469–630 HP (variant dependent) |
| Firing Order | 1-5-4-8-3-7-2-6 | 1-3-7-2-6-5-4-8 |
| Exhaust Note | Higher-pitched, Ferrari-like | Traditional V8 burble |
| Rev Character | Sharper, faster-revving | Smoother, torque-biased |
| Vehicles | AMG GT, GTS, GTR, GT R Pro, GT C, GT 63 | C63, E63, G63, GLC63, CLS63 |
| Crate Engine Price (YPG) | $35,000 | $29,999 |
YPG M178 Crate Engine — What You Get
The YPG M178 crate engine is a complete, ready-to-install long block built to OEM specification with genuine AMG components. This is not a remanufactured or salvage unit — it is a new engine assembly shipped directly to your shop or home.
| Component | Specification |
|---|---|
| Block | Aluminum alloy closed-deck, 4.0L displacement |
| Crankshaft | Forged steel flat-plane |
| Connecting Rods | Forged steel |
| Pistons | Forged aluminum |
| Cylinder Heads | Aluminum DOHC 32-valve |
| Valvetrain | 4 valves per cylinder, hydraulic lifters |
| Oil System | Dry sump with external tank |
| Turbochargers | Twin-scroll (hot-V, inboard-mounted) |
| Warranty | YPG build warranty included |
Crate Engine vs Rebuild — When Each Makes Sense
| Factor | YPG Crate Engine ($35,000) | Full Engine Rebuild |
|---|---|---|
| Turnaround Time | Ships immediately — drop-in install | 4–8 weeks depending on parts availability |
| Risk | New components, known condition | Depends on block and head condition after teardown |
| Best For | Catastrophic failure, race builds, engine swaps | High-mileage refresh with known-good block |
| Upgrade Path | Start fresh — add forged internals, ported heads | Upgrade during rebuild — adds cost and time |
| Core Return | Not required | N/A — your engine is the core |
| Downtime | 2–5 days install at a qualified shop | Weeks to months |
Building on the M178 — Compatible Upgrades
The M178 crate engine is the ideal starting point for a high-power AMG GT build. YPG offers every supporting component to take the platform from stock output to 900+ WHP:
| Upgrade | Power Contribution | Price |
|---|---|---|
| Stage 1 ECU Tune (stock turbos) | +80–120 HP | $1,799 |
| Stage 2 ECU Tune (downpipes installed) | +150–200 HP | $1,799 |
| Catless Downpipes | Supports Stage 2+ calibration | From $1,999 |
| Stage 3 Hybrid Turbochargers | +250–350 HP over stock | $5,999 |
| Stage 3 Race Turbochargers (AMG GT) | Up to 900 WHP | $6,999 |
| Stage 4 Race Turbochargers (AMG GT) | 1,000+ WHP capable | $9,999 |
| Forged Internals (rods + pistons) | Supports 1,000+ HP reliably | $6,599 |
| Ported Cylinder Heads | Improved airflow for high-boost builds | $6,500 |
| M178 Air Inlets | Better turbo spool and airflow | $1,899 |
Recommended M178 Products
Total Build Cost Planning — M178 AMG GT
The total cost of a high-power M178 build depends on your target output. Here are three common build tiers with approximate total costs including the crate engine:
| Build Tier | Target Output | Components | Approximate Total |
|---|---|---|---|
| Stage 2 Street | 650–700 WHP | Crate engine + downpipes + Stage 2 ECU | $39,000–$41,000 |
| Stage 3 Track | 800–900 WHP | Crate engine + Stage 3 turbos + downpipes + ECU + air inlets | $50,000–$55,000 |
| Stage 4 Race | 1,000+ WHP | Crate engine + forged internals + ported heads + Stage 4 turbos + full supporting mods + ECU | $70,000–$80,000 |
Frequently Asked Questions: M178 Crate Engine
What is included in the YPG M178 crate engine?
Does the M178 crate engine come with turbochargers?
Can I install the M178 crate engine in a non-AMG GT chassis?
How long does installation take?
What is the difference between the M178 and M177 crate engine?
Do I need forged internals with the crate engine?
Does YPG ship the crate engine internationally?
Can I return my old engine as a core?
Related YPG Motorsport Guides
YPG Motorsport — M178 Crate Engines Shipped Worldwide
From complete crate engines to forged internals and race turbochargers, YPG Motorsport supplies every component for AMG GT M178 builds. GCC-based engineering with worldwide shipping and remote ECU calibration.
ECU Tuning Kuwait · ECU Tuning Saudi Arabia · ECU Tuning Qatar · ECU Tuning UAE