IRP connecting rods, MERCEDES M177 4.0L, C63S / 63serie AMGs

Italian RP (IRP) reinforced connecting rods for racing and performance use

The renowned Italian IRP connecting rods are available in three different strength levels depending on the application.
These rods are not the cheapest on the market, but they are engineered to withstand extreme loads such as Stage 3 and Stage 4 builds or demanding motorsport use.
They directly replace the OEM components and are built to handle high boost, heat, and RPM reliably.

If you are also purchasing pistons, check out our value-priced IRP piston + rod packages in our webshop –
Forged piston kits.

We also supply fully custom-dimension IRP pistons and rods – contact us for details.

What’s included

• High-strength H-beam connecting rod set
• Reinforced bushings, precision-machined big ends
• Standard rod bolts: VIMI2500 type. L19 or Custom Age bolt upgrades available separately as an option

Kit levels

Select the specification that matches your build:

• Silver – Popular choice, strong performance for tuned engines in street and track use
• Gold – Higher-grade materials and tighter tolerances for increased power targets
• Platinum – Top-level package for extreme power, endurance, and dedicated motorsport use

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Specifications

Compatible models	MERCEDES C63S AMG / E63S AMG / S63 AMG / GT63 AMG / GLC63 AMG / GLE63 AMG / GLS63 AMG / SL55 AMG / SL63 AMG / G63S AMG (4.0LTR.)
Engine type	M177 4000cc
Stroke length	OEM
Pin size	22.000
Big end diameter	55.600
Big end width	18.85
Center-to-center length	153.100

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IRP Racing Connecting Rods

• Strong H-beam rods designed to handle high torque and RPM
• Supplied with VIMI2500 bolts as standard; L19/Custom Age upgrades available
• Finish-honed to OEM-spec bearing clearances

Fitment & ordering

Parts are model- and engine-specific. Select bore size and compression ratio from the product menu.
If you are unsure about fitment, contact us via WhatsApp, email, or contact form – our experts will gladly assist you!

Rod bolt options

Standard kits include VIMI2500 bolts. For builds targeting very high cylinder pressures, RPM or long-term endurance use, upgraded L19 and Custom Age bolts are available as optional add-ons.
These are sold separately.

Additional information & links

• IRP main catalog (PDF)
• Installation instructions, connecting rods

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