MAR591 Aftermarket Mercruiser Exhaust Elbow GM V6 & V8 Engines (2002+) | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Exhaust Elbow GM V6 & V8 Engines (2002+) - Part Number: MAR591

A high dry-joint exhaust elbow for MerCruiser GM V6 and small-block V8 engines introduced in 2002. The 864591T02 family has a 7-degree outlet, 4-inch hose connection and approximately 205mm overall height.

⚙️ Key Features

• MerCruiser dry-joint design

• 7-degree riser angle

• 4-inch exhaust-hose outlet

• High 205mm elbow configuration

• For 2002-and-later GM V6/V8 engines

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 864591T02 (current documented OEM reference for the MAR591 pattern)

OEM / Related Numbers:

• MAR591

• 864591T02

• 77235A8

Aftermarket / Verified Equivalents:

• Recmar: MAR591

• Sierra: 18-1845

• Barr Marine: BAMC-20-864591

• Osco: OSC4591

🚤 Compatibility

Commonly used on:

• MerCruiser dry-joint V6 and V8 exhaust systems

Typically suits:

• Engine models:

• MerCruiser 4.3L V6 Alpha, Bravo and MPI from 2002

• MerCruiser 5.0L V8 from 2002

• MerCruiser 5.7L / 350 MAG MPI from 2002

• MerCruiser 6.2L / 377 and 383 from 2002

• MerCruiser MIE and Ski configurations using 864591T02

• Joint Type: dry joint

• Riser Angle: 7°

• Exhaust Outlet: 4 in

• Overall Height: approximately 205mm

• Year Range: approximately 2002 onward

🔌 Function

The high elbow raises and turns exhaust from the dry-joint manifold and injects cooling water downstream of the sealing joint.

Common signs of failure:

• External corrosion, cracking or pin-hole leakage

• Internal carbon, rust or salt restriction

• Cooling water entering the manifold, turbocharger or cylinders

• Steam, reduced cooling-water discharge or an abnormally hot exhaust hose

• Loss of power caused by excessive exhaust back-pressure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging