BoostLine Forged Connecting Rod Set – Mitsubishi 4G63T 7-Bolt

When increasing the boost and power output of the legendary Mitsubishi 4G63T engine, the connecting rods become one of the most important components inside the engine. The BoostLine MI5906-866 Connecting Rod Set has been developed for demanding high-cylinder-pressure applications where strength and reliability are essential.

The MI5906-866 is manufactured from premium 4340 forged steel and uses BoostLine’s patented three-pocket rod architecture. The design combines high structural rigidity with optimised material placement to provide significantly greater resistance to bending loads than a conventional performance H-beam connecting rod.

Designed for High-Boost 4G63T Engines

BoostLine developed these connecting rods specifically for highly stressed forced-induction and nitrous applications. The manufacturer rates the design as suitable for extremely high-output engine combinations, with this application marketed as capable of supporting 1000+ hp builds when used as part of a correctly specified and assembled engine.

This makes the MI5906-866 particularly suitable for:

• Fast-road Mitsubishi Evo builds
• Track and competition engines
• Drag racing applications
• High-boost turbo conversions
• Big-turbo 4G63T builds
• Fully forged engine builds
• Motorsport applications

Premium 4340 Forged Steel

Each connecting rod is produced from high-strength 4340 forged steel, providing the toughness and fatigue resistance required for engines operating at substantially higher cylinder pressures than standard.

BoostLine rods are individually inspected and finish-honed, with dimensional inspection forming an important part of the manufacturing and quality-control process.

ARP 2000 Connecting Rod Bolts

The standard MI5906-866 set is supplied with 3/8-inch ARP 2000 rod fasteners.

This distinction is important because BoostLine also manufactures the MI5906-866+, which is the upgraded version using CA625+ fasteners. MI5906-866 is the ARP 2000 specification.

BoostLine Three-Pocket Design

Rather than relying on a conventional H-beam profile, BoostLine uses its patented three-pocket architecture to position material where it contributes most effectively to rod strength.

According to BoostLine application information, the design offers substantially improved bending strength compared with conventional H-beam connecting rods, making it particularly suitable for high-cylinder-pressure turbocharged engines.

Technical Specifications

The published dimensional specifications for MI5906-866 include a 150.00 mm length, 22.00 mm pin, 45.00 mm journal, 48.009 mm housing bore and approximately 657 g nominal rod weight.

Vehicle Compatibility

Designed for Mitsubishi 4G63T 7-bolt engines, including Mitsubishi Lancer Evolution Evo IV, Evo V, Evo VI, Evo VII, Evo VIII and Evo IX applications. Multiple specialist application listings specifically identify MI5906-866 for Evo 4–9 4G63 engines.

Important: Engine specification should always be checked before ordering. This connecting rod uses a 22 mm piston pin and 7-bolt 4G63 configuration and should not be selected purely from vehicle registration or model name.

Why Choose BoostLine MI5906-866?

If you’re building a high-power Mitsubishi 4G63T, the MI5906-866 gives you:

• Premium forged 4340 steel construction
• Strength designed for extreme cylinder pressure
• ARP 2000 rod bolts included
• Precision 150 mm factory-style rod length
• 22 mm piston-pin compatibility
• Patented BoostLine three-pocket construction
• Engineering aimed specifically at turbocharged high-output engines
• A matched set of four rods ready for your engine build

Whether you’re refreshing a fast-road Evo or assembling a serious motorsport 4G63T engine, the BoostLine MI5906-866 forged conrod set provides a strong foundation for a properly engineered performance build.

Package Contents

1 x Set of 4 BoostLine Forged Connecting Rods with ARP 2000 Fasteners