Cummins ISB 4.5 Parts for Canada - Exhaust Section

Cummins ISB 4.5L Exhaust Manifold & Components

The exhaust system on the Cummins ISB 4.5L engine plays a critical role in maintaining optimal engine performance, ensuring exhaust gases are efficiently expelled, and supporting effective turbocharger operation. A properly maintained exhaust manifold not only maximizes power output but also helps keep exhaust temperatures in check and reduces the risk of turbo and cylinder head damage.

At Diesel Pro Power, trusted by over 40,000 satisfied customers, we offer a complete range of exhaust-related components for the Cummins ISB 4.5L—including the manifold itself, gaskets, insulation, flanges, mufflers, and end caps—designed for both marine and industrial applications.

Importance of the Exhaust Manifold on the ISB 4.5L

The exhaust manifold channels high-temperature gases from the combustion chambers toward the turbocharger and exhaust piping. On the Cummins ISB 4.5L, the manifold is engineered to handle extreme heat cycles and resist cracking. Damage or leaks at this point can lead to loss of turbo boost, reduced efficiency, and excessive exhaust noise. Keeping the manifold and related hardware in peak condition is essential for long-term reliability.

Intake & Exhaust Interface Components

Intake Manifold Cover Gasket

The intake manifold cover gasket seals the upper section of the manifold, preventing air leaks that could disturb the air-to-fuel ratio. A failing gasket can result in poor engine performance, black smoke, or unusual turbo sounds. Our replacement gaskets are manufactured to OEM specifications for a precise fit and optimal sealing performance.

Exhaust Heat Protection & Insulation

High exhaust temperatures can affect surrounding components such as wiring, hoses, and even the operator compartment in enclosed engine rooms. Using the correct insulation materials protects both the engine and crew.

Manifold Insulation Tape – 3" Wide

This heat-resistant insulation tape is 3 inches wide, 100 feet long, and 1/8 inch thick—ideal for wrapping around exhaust manifold sections, elbows, and downpipes. It reduces surface temperature and helps control radiant heat inside the engine compartment.

Manifold Insulation Tape – 4" Wide

With the same 100-foot length and 1/8-inch thickness, this wider version provides better coverage for larger diameter exhaust sections. It is particularly useful when wrapping straight sections of pipe or when minimizing the number of overlapping passes is important.

Exhaust Connection Hardware

Flange for Industrial Exhaust Manifold – 4" Inside Diameter

This heavy-duty flange connects exhaust manifold outlets to piping or mufflers. Designed for industrial durability, it ensures a tight, vibration-resistant seal that can withstand constant thermal expansion and contraction.

Gasket for 4" Manifold Flange

The corresponding flange gasket provides a leak-free seal between the flange and connected exhaust components. Built from high-temperature-resistant materials, it prevents exhaust gas leaks that could lead to heat damage or performance loss.

Mufflers & Sound Attenuation

Industrial Muffler – 4" Inlet and Outlet

Our industrial-grade muffler for the Cummins ISB 4.5L features a 4-inch National Pipe Thread inlet and outlet, engineered to reduce exhaust noise while maintaining optimal backpressure for turbocharger performance. Ideal for applications where noise control is essential, such as marine vessels, generator sets, and enclosed industrial machinery.

Muffler End Caps & Closures

When an exhaust section is not in use or requires protection from debris and moisture ingress, muffler end caps are essential.

3" Muffler Cap

Fits a 2.99-inch outside diameter pipe, offering a snug fit to protect against weather exposure and internal corrosion.

3.5" Muffler Cap

Designed for pipes with a 3.50-inch outside diameter, this cap provides long-lasting protection in marine and outdoor industrial environments.

4.5" Muffler Cap

For larger exhaust outlets measuring 4.49 inches outside diameter, this cap keeps rain, dust, and insects from entering the exhaust path when the engine is not running.

5" Muffler Cap

Fitting a full 5-inch outside diameter pipe, this cap is often used on larger auxiliary exhaust ports or equipment with oversized mufflers.

Maintenance Tips for Cummins ISB 4.5L Exhaust Systems

• Inspect regularly for leaks — Look for soot marks, cracks, or missing bolts around the manifold.

• Replace gaskets proactively — Heat cycles eventually harden and degrade gasket material; replacing them before leaks develop can save on costly repairs.

• Use proper insulation — High-temp insulation tape extends the life of nearby components and improves engine compartment safety.

• Monitor backpressure — Excessive backpressure can harm turbo performance; ensure the muffler and piping are free from restrictions.

• Secure all fasteners — Loose manifold bolts are a common cause of warped flanges and exhaust leaks.

Applications for Cummins ISB 4.5L Exhaust Components

These components are suitable for both marine and industrial versions of the Cummins ISB 4.5L engine, including:

• Marine propulsion engines

• Marine auxiliary generators

• Industrial generator sets

• Construction equipment

• Agricultural machinery