Upgrade your semi-truck 's style with our 6-5 inch chrome exhaust stacks. Available in various designs, including flat top and curved turnouts, these high-quality stacks enhance the look of your ride.
Frequently Asked Questions About 6-5 Inch Semi-Truck Exhaust Stacks
What's the difference between straight cut and curved/mitered exhaust stacks?
Straight cut stacks provide maximum exhaust flow and a classic look, while curved or mitered stacks direct exhaust away from your trailer and cab. Curved stacks are ideal if you haul temperature-sensitive loads or want to minimize soot buildup on your trailer. Mitered cuts typically angle at 15-45 degrees and offer a good balance between performance and exhaust direction control.
Will 6-inch or 5-inch stacks fit my truck without modification?
Most semi-trucks can accommodate 6-inch stacks, but clearance varies by model. Peterbilt 379/389 and Kenworth W900 typically have ample room for 6-inch stacks. For Freightliner Cascadia and Volvo VNL models, measure the space between your frame rails and existing components first. You'll need at least 7 inches of clearance for 6-inch stacks with clamps. Some International and Mack models may require bracket modifications or stack relocation.
What's the real difference between chrome and stainless steel stacks?
Chrome-plated stacks offer a mirror finish at a lower initial cost but require regular polishing and may show pitting after 2-3 years in harsh conditions. 304 stainless steel stacks cost more upfront but maintain their appearance with minimal maintenance and resist corrosion better in salt-heavy environments. For trucks running northern routes or near coastal areas, stainless steel typically provides better long-term value.
Do I need to modify my exhaust system to install these stacks?
Installation requirements depend on your current setup. If you're replacing existing 5 or 6-inch stacks, it's usually a direct swap using your current clamps and brackets. When upgrading from smaller diameter pipes, you'll need reducer adapters and possibly new mounting brackets. Most installations take 1-2 hours per stack. Check that your turbo outlet and existing piping can support the increased flow of larger diameter stacks.
How do stack length and diameter affect engine performance and sound?
Longer stacks (48-72 inches) generally produce a deeper tone and better exhaust scavenging, while shorter stacks (36-48 inches) give a sharper, louder sound. The 6-inch diameter provides less back pressure than 5-inch, which can improve turbo spool-up and EGT readings by 50-100 degrees on older mechanical engines. However, newer emissions-controlled engines show minimal performance difference. Stack diameter mainly affects sound volume and tone rather than horsepower gains.
