Mercedes-Benz M273 Forged Internals — Rods & Pistons Kit
The Mercedes-Benz M273 5.5L naturally aspirated V8 is the SOHC 3-valve engine that powered a generation of flagship Mercedes models — the S550 (W221), E550 (W211), CLS550 (C219), CL550 (C216), SL550 (R230), ML550 (W164), GL550 (X164), and CLK550 (C209). Known for smooth power delivery and solid reliability, the M273 is increasingly popular as a forced induction platform — but the factory cast internals become the failure point under boost.
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 turbo conversions and sustained high-RPM abuse. The essential bottom-end upgrade for any M273 owner building serious power.
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 internals are the first failure point under forced induction
- Forged components handle higher cylinder pressure and heat
- Essential for turbo conversion builds
- Drop-in fitment — no block machining required
Fits
- Mercedes-Benz S550 (W221)
- Mercedes-Benz E550 (W211)
- Mercedes-Benz CLS550 (C219)
- Mercedes-Benz CL550 (C216)
- Mercedes-Benz SL550 (R230)
- Mercedes-Benz ML550 (W164)
- Mercedes-Benz GL550 (X164)
- Mercedes-Benz CLK550 (C209)
Professional installation required. Contact YPG Motorsport for engine build packages and turbo conversion kits.
