Frequently Asked Questions About International 9900/i/ix CAC Clamps, Boots & Hoses

What years and models are these CAC components compatible with?

These charge air cooler clamps, boots, and hoses are designed specifically for International 9900, 9900i, and 9900ix models from 1998 through 2017. However, compatibility can vary based on your engine type (ISX, C15, or Detroit Series 60) and whether you have an aftermarket intercooler setup. We recommend checking your existing boot diameter and clamp size before ordering, as some mid-year production changes occurred.

What's the difference between silicone and rubber CAC boots, and which should I choose?

Silicone boots typically handle temperatures up to 500?F and resist oil degradation better than standard rubber boots, which max out around 250?F. Silicone boots last 3-5 times longer but cost more upfront. If you're running high boost pressure (over 40 PSI) or frequently haul heavy loads, silicone is worth the investment. Standard rubber boots work fine for lighter duty applications and moderate boost levels.

What size clamps do I need, and are T-bolt clamps really necessary?

Most International 9900 series trucks use 3.5" to 4" CAC boots, requiring clamps in the 3.75" to 4.25" range. T-bolt clamps provide more uniform clamping pressure than standard worm-gear clamps and are essential for boost pressures above 35 PSI. They're also less likely to cut into silicone boots. Always measure your existing setup, as some trucks have been modified with different intercooler piping.

How difficult is installation, and what tools will I need?

Installation typically takes 1-2 hours and requires basic hand tools: socket set, flathead and Phillips screwdrivers, and possibly a heat gun for stubborn boots. The main challenge is accessing the lower CAC connections, which may require removing the bumper or splash shields. Apply a thin layer of silicone spray or dish soap to boot surfaces for easier installation. Torque T-bolt clamps to 50-60 inch-pounds to avoid over-tightening.

How often should CAC boots and clamps be replaced?

Inspect CAC boots every oil change for soft spots, cracks, or oil saturation. Rubber boots typically last 150,000-200,000 miles under normal conditions, while quality silicone boots can exceed 500,000 miles. Replace clamps if they show rust, stripped threads, or won't maintain proper tension. Most drivers keep spare boots and clamps on hand, as roadside failures can leave you stranded and potentially damage your turbo from overboost conditions.