Volvo VNL Gen III Exhaust Parts

Frequently Asked Questions About Volvo VNL Gen III Exhaust Parts

What years and models are compatible with these Gen III exhaust parts?

These exhaust parts are specifically designed for Volvo VNL trucks manufactured from 2018 to present (Gen III models). They fit VNL 300, 400, 640, 740, 760, and 860 series. Always verify your truck's OEM and model year before ordering, as pre-2018 VNL models require different exhaust components. The Gen III designation refers to the redesigned body style that Volvo introduced in 2018.

Are these exhaust stacks chrome-plated steel or stainless steel, and which is better for my needs?

We offer both chrome-plated steel and polished stainless steel options. Chrome-plated stacks provide a mirror-like finish at a lower initial cost but require regular polishing and may show pitting after 2-3 years in harsh conditions. Stainless steel stacks cost more upfront but resist corrosion better and maintain their appearance longer with minimal maintenance. For trucks in northern climates with heavy road salt exposure, stainless steel typically provides better long-term value.

Do I need special tools or professional installation for these exhaust components?

Most exhaust stack installations can be completed with standard hand tools including wrenches, sockets, and clamps. However, DPF and muffler replacements often require cutting and welding, which should be done by a qualified technician. Stack installations typically take 1-2 hours per side. We recommend having penetrating oil on hand for removing old hardware, and always use new clamps and gaskets to ensure proper sealing.

What size exhaust stacks fit the Gen III VNL, and will larger stacks affect performance?

Gen III VNL trucks accommodate 5-inch or 6-inch diameter stacks without modification. The standard exhaust outlet is 5 inches, so 6-inch stacks require a reducer sleeve. Larger diameter stacks do not improve performance on stock engines but can reduce exhaust gas velocity. Many drivers choose 6-inch stacks purely for appearance. Stack length options range from 48 to 72 inches, with 60-inch being most common for balanced appearance and practicality.

How do I prevent exhaust leaks and rattling after installation?

Proper installation is critical for preventing leaks and rattles. Use high-temperature exhaust sealant on all slip joints and ensure clamps are tightened to manufacturer specifications (typically 60-80 ft-lbs for band clamps). Install rubber isolation mounts between the stack and mounting brackets to reduce vibration. Check and retighten all connections after the first 500 miles of operation, as thermal cycling can cause initial loosening. Replace any damaged or worn gaskets during installation rather than reusing old ones.