Mack CH/CHN/CHU Truck Exhaust Parts

Frequently Asked Questions About Mack CH/CHN/CHU Truck Exhaust Parts

What exhaust stack sizes fit the Mack CH, CHN, and CHU models?

Most Mack CH, CHN, and CHU trucks from 1988-2009 are designed to accommodate 5-inch diameter exhaust stacks as standard. The factory exhaust ports typically accept 5-inch OD pipes, though some operators upgrade to 6-inch or 7-inch stacks using adapter kits. When ordering, verify your current stack diameter at the base where it connects to the elbow or turbo outlet. Chrome stacks are available in lengths from 36 to 72 inches, while painted stacks often come in 48 to 60-inch options.

Are these exhaust parts compatible with both single and dual exhaust configurations?

Yes, our Mack CH/CHN/CHU exhaust parts support both single and dual configurations. Single exhaust setups typically exit on the passenger side behind the cab, while dual systems require Y-pipes to split from the turbo outlet. CHU models with set-forward axles may have different routing requirements than standard CH models. When converting from single to dual exhaust, you'll need additional brackets, clamps, and possibly a crossover pipe depending on your specific year and engine configuration.

What's the difference between aluminized and stainless steel exhaust components for these trucks?

Aluminized steel parts offer good corrosion resistance at a lower price point and typically last 3-5 years in normal conditions. They're ideal for trucks in moderate climates or those on regular replacement schedules. Stainless steel components (usually 409 or 304 grade) provide superior longevity of 7-10+ years and better heat resistance, making them worth the investment for severe-duty applications or coastal environments. Chrome-plated stacks offer the best appearance but require regular polishing and may show pitting after 2-3 years in harsh conditions.

Do I need special tools or modifications to install these exhaust parts?

Basic installation of most exhaust components requires standard hand tools including socket sets, band clamp tools, and potentially a sawzall for trimming. Factory replacement parts typically bolt directly to existing mounting points without modification. However, aftermarket performance mufflers or stack relocations may require new bracket holes to be drilled. Elbow replacements often need exhaust sealant or gaskets (not always included). Professional installation takes 2-4 hours for a complete system, while DIY stack or muffler swaps can be done in 30-90 minutes with proper lifting equipment.

Will aftermarket exhaust parts affect my engine warranty or emissions compliance?

Replacement exhaust parts that maintain factory specifications (same backpressure, catalyst compatibility) typically don't affect warranties. However, removing DPF systems, catalysts, or significantly altering exhaust flow can void engine warranties and violate emissions regulations. For 2007 and newer CHU models with DPF systems, ensure any replacement parts are EPA-compliant and maintain proper sensor bungs. Pre-2007 CH and CHN models have fewer restrictions, but straight pipes or gutted mufflers may still cause inspection failures in certain states. Always verify local regulations before modifying emission control components.