Mercedes-Benz M278 Forged Internals — Rods & Pistons Kit
The Mercedes-Benz M278 4.7L twin-turbo V8 is the workhorse behind the E550, S550, CLS550, GL550, GLE550, GLS550, and G550. While not an AMG engine, the M278 is a popular platform for twin-turbo upgrades and tuning — delivering serious power gains with downpipes, intakes, and ECU calibration. But the factory cast internals become the ceiling at higher power levels.
YPG Motorsport's forged internals kit replaces the factory rods and pistons with forged H-beam connecting rods and forged aluminum pistons, rated for 1,500HP+ and built to handle aggressive boost and sustained high-RPM use. The go-to upgrade for any M278 owner serious about unlocking the platform's full potential.
What's Included
- 8x Forged H-beam connecting rods (ARP hardware)
- 8x Forged aluminum pistons with rings and wrist pins
- Balanced and matched set
Why Upgrade
- Factory cast rods and pistons are the failure point at higher power levels
- Forged components handle higher cylinder pressure and heat
- Essential for turbo upgrade builds and aggressive tuning
- Drop-in fitment — no block machining required
Fits
- Mercedes-Benz E550 (W212)
- Mercedes-Benz S550 (W222)
- Mercedes-Benz CLS550 (C218)
- Mercedes-Benz GL550 / GLS550 (X166)
- Mercedes-Benz GLE550 (W166)
- Mercedes-Benz G550 (W463)
Professional installation required. Contact YPG Motorsport for engine build packages and turbo upgrade kits.
