BoostLine Forged Conrod Set Mitsubishi Lancer Evo X 4B11T 2.0 Turbo ARP 625+ – MI5657-905-PLUS

BoostLine Forged Conrod Set – Mitsubishi Lancer Evolution X 4B11T – ARP 625+ – MI5657-905-PLUS

Upgrade the bottom end of your Mitsubishi Lancer Evolution X 4B11T with the BoostLine Forged Connecting Rod Set MI5657-905-PLUS, engineered specifically for extreme-performance turbocharged and motorsport engine builds.

Manufactured from premium forged 4340 steel, BoostLine connecting rods feature the company’s patented three-pocket design, combining excellent strength with reduced rotating mass. This innovative construction provides significantly increased resistance to bending compared with a conventional H-beam connecting rod, making these rods particularly suited to high boost, competition and high-horsepower 4B11T applications.

The MI5657-905-PLUS version is supplied with premium ARP Custom Age 625+ rod bolts, offering an important upgrade for serious performance engines where exceptional fastener strength and reliability are required.

BoostLine states that these rods have been proven in 1000+ horsepower four-cylinder applications, making them an excellent choice for Mitsubishi Evo X owners building anything from a fast road car to a dedicated drag, track or motorsport engine.

Key Features

• Designed specifically for the Mitsubishi Lancer Evolution X 4B11T
• Complete set of 4 forged connecting rods
• Manufactured from premium 4340 forged steel
• Patented BoostLine three-pocket rod design
• ARP Custom Age 625+ connecting rod bolts
• Designed for extreme turbocharged and high-boost applications
• Suitable for 1000+ HP engine builds
• Approximately 60% greater bending strength compared with conventional H-beam designs
• Reduced tensile stress compared with traditional H-beam designs
• High-quality AMPCO bronze wrist-pin bushings
• Individually subjected to a detailed 26-point CMM inspection
• Inspection report supplied with each set
• Ideal for high-performance road, drag, track and motorsport builds

Technical Specifications

Why Choose BoostLine Conrods for the Evo X?

Increasing boost and cylinder pressure places enormous loads on the connecting rods in the 4B11T engine. Standard connecting rods can become a limiting factor as power levels rise, particularly on engines running upgraded turbochargers, increased boost pressure, race fuel or aggressive ECU calibration.

BoostLine’s three-pocket forged rod design has been developed to provide exceptional big-end stability and bending resistance without unnecessarily increasing rotating mass. This makes the MI5657-905-PLUS an excellent foundation for a serious Mitsubishi Evo X forged engine build.

The inclusion of ARP 625+ fasteners makes this PLUS specification particularly suitable for high-output builds where maximum connecting-rod bolt strength is required.

Ideal For

• Mitsubishi Evo X forged engine builds
• Big turbo conversions
• High-boost 4B11T engines
• Fast road applications
• Drag racing
• Track cars
• Time attack builds
• Motorsport applications
• Engine rebuilds targeting substantially increased power

Vehicle Application

Designed for:

Mitsubishi Lancer Evolution X / Evo 10 equipped with the 2.0-litre turbocharged 4B11T engine.

This includes relevant UK-market GSR and FQ-series Evo X models, providing they retain the compatible Mitsubishi 4B11T engine configuration.

What’s Included?

• 4 × BoostLine forged 4340 steel connecting rods
• ARP Custom Age 625+ rod bolts
• AMPCO bronze pin bushings
• BoostLine dimensional inspection documentation

Important Fitment Information

These are specialist internal engine components. Engine specification, crankshaft dimensions, pistons, wrist-pin diameter and intended engine build should always be checked before installation.

Professional engine assembly, measurement of bearing clearances and correct ARP fastener installation procedures are strongly recommended.

SKU: MI5657-905-PLUS

The technical dimensions, 4340 material, 622 g rod weight, 23 mm pin, 52 mm journal, ARP 625+ hardware and other specifications above come directly from BoostLine.