Frequently Asked Questions About Freightliner FLD SBA Chrome Stacks & Tops

What years and models of Freightliner FLD are these chrome stacks compatible with?

These chrome stacks and tops are specifically designed for Freightliner FLD models with Set Back Axle (SBA) configurations, typically covering model years 1989-2007. The SBA designation is crucial - these will not fit standard FLD or Set Forward Axle models. Always verify your specific truck configuration before ordering, as the frame rail spacing and mounting points differ between SBA and non-SBA models.

What gauge steel are these stacks made from, and will they rust or discolor over time?

Most quality chrome stacks for FLD SBA models are constructed from 304 stainless steel with a mirror-polished chrome finish. The steel thickness typically ranges from 16-gauge to 18-gauge depending on the manufacturer. With proper maintenance including regular cleaning and polishing, these stacks should maintain their shine for years. However, exposure to road salt, exhaust heat, and environmental conditions can cause discoloration if not properly maintained. We recommend using chrome polish every 2-3 months for best results.

Do I need special brackets or modifications to install these stacks on my FLD SBA?

Installation requirements vary by your current exhaust setup. If you're replacing existing stacks, you can often reuse your current mounting brackets and clamps. For new installations, you'll need stack clamps (typically 5-inch or 6-inch depending on your stack diameter) and possibly new mounting brackets. Some drivers need to adjust or relocate air cleaner brackets for proper clearance. The installation typically takes 2-4 hours and requires basic hand tools - no cutting or welding is usually necessary.

What's the difference between straight cut, curved, and miter cut stack tops?

Straight cut tops provide a classic, clean look and are the most common choice. Curved or turnout tops direct exhaust away from the truck and trailer, reducing soot buildup on your equipment. Miter cut tops feature an angled cut (usually 15-30 degrees) that adds a custom appearance while providing some exhaust direction. Consider your typical loads and aesthetic preferences - flatbed haulers often prefer curved tops to keep exhaust off their loads, while owner-operators focused on appearance might choose miter cuts.

What diameter and length options work best for the FLD SBA, and will longer stacks affect performance?

The most common diameters for FLD SBA trucks are 5-inch and 6-inch, with 5-inch being standard on most factory setups. Stack lengths typically range from 36 to 72 inches, with 48-60 inches being most popular. Longer stacks (above 60 inches) can create slightly more exhaust backpressure but the effect on performance is minimal on modern diesel engines. Choose length based on your cab height and personal preference - remember that taller stacks may require guy wires for stability and could pose clearance issues in some areas.