Frequently Asked Questions About International RH Chrome Stacks & Tops

What size exhaust stacks fit my International RH model, and how do I measure for the correct diameter?

International RH trucks typically use 5-inch or 6-inch diameter stacks, depending on your engine configuration. To measure correctly, use a tape measure to find the outside diameter (OD) of your existing exhaust pipe where the stack will mount. For curved stacks, also measure the clearance between your cab and any fairings - most RH models need 18-24 inches of clearance for proper fitment. If you have a DPF/DEF system, ensure your stack accommodates the aftertreatment outlet, which may require a reducer.

Will these chrome stacks rust or discolor from exhaust heat, and what grade of stainless steel should I look for?

Quality chrome stacks for International RH trucks should be made from 304-grade stainless steel with a mirror polish finish. This grade resists rust and maintains its shine even with constant exposure to exhaust temperatures up to 800?F. Lower-grade stacks (201 stainless or chrome-plated mild steel) will show blue/gold discoloration within months. Look for stacks with at least 16-gauge thickness for durability. Regular cleaning with stainless polish every 2-3 months helps maintain the chrome finish.

Do I need special brackets or adapters to install stacks on my International RH, and are they included?

Most International RH chrome stacks require band clamps for installation, which are typically sold separately. You'll need 5-inch or 6-inch band clamps depending on your stack diameter. Some RH models with factory vertical exhaust already have mounting brackets, while others may need an exhaust elbow kit (45? or 90?) to route from the horizontal outlet. Check if your truck has the factory stack provisions behind the cab - if not, you may need additional mounting hardware and possibly cab modifications.

What's the difference between straight, curved, and miter-cut stack styles for International RH trucks?

Straight stacks provide a classic look and are easiest to install, sitting flush against the cab. Curved stacks angle away from the cab at the top, directing exhaust away from the trailer and reducing soot buildup on your equipment. Miter-cut stacks feature an angled top cut (usually 15-30 degrees) for an aggressive appearance and can help with exhaust flow. For RH models pulling refrigerated trailers, curved stacks are recommended to keep exhaust away from the reefer unit.

Are chrome stack rain caps necessary, and which styles work best for International RH trucks?

Rain caps are highly recommended to prevent water damage in your exhaust system and engine. For International RH trucks, weighted flapper-style caps are most popular as they open automatically with exhaust pressure and close when the engine is off. Bull-nose and turn-down tops are permanent solutions that don't require moving parts but may slightly restrict exhaust flow. Avoid spring-loaded caps on trucks with DPF systems as they can cause excessive backpressure. Choose caps that match your stack diameter exactly for proper sealing.