Frequently Asked Questions About Mack Superliner Universal Elbows & Piping

What size exhaust piping fits my Mack Superliner, and how do I measure for the correct elbow angle?

Most Mack Superliners use 5-inch diameter exhaust systems, though some models may have 6-inch setups. To determine your elbow angle, measure from where the pipe exits your muffler to where it needs to turn - common angles are 45, 60, and 90 degrees. For stack applications, measure the distance between your cab and sleeper to ensure proper clearance. We recommend using a flexible measuring tape or string to follow the exact path your exhaust will take.

Will these universal elbows work with my 1985-1993 Superliner, or do I need model-specific parts?

Our universal elbows are designed to fit all Mack Superliner models from 1977-1993, including both RW and MH series. The key is matching your existing pipe diameter and choosing the correct angle. While the mounting brackets and stack positions varied slightly between early and late models, the actual piping dimensions remained consistent at 5-inch OD throughout the Superliner production run.

What grade of stainless steel should I choose, and how long will chrome-plated mild steel last?

We offer both 409 stainless steel and chrome-plated aluminized steel options. The 409 stainless provides excellent corrosion resistance and typically lasts 5-7 years in normal conditions. Chrome-plated options offer a mirror finish but may show pitting after 2-3 years in harsh climates or with heavy salt exposure. For maximum longevity in coastal areas or winter salt conditions, choose 409 stainless and polish it periodically.

Do I need to weld these elbows, or can I use clamps for installation?

Both methods work, but we recommend using heavy-duty 5-inch exhaust clamps for easier installation and future serviceability. Ensure you use quality band clamps rated for diesel exhaust temperatures (1000?F+). If welding, remember that stainless requires specific welding rods and techniques. Many drivers prefer clamps because they allow for minor adjustments during installation and make stack removal easier for maintenance.

How do I prevent exhaust leaks at the elbow joints after installation?

Apply high-temperature exhaust sealant (rated for 1500?F) to all slip-fit connections before clamping. Ensure pipes overlap at least 3 inches at each joint for a proper seal. Torque clamps to manufacturer specifications (typically 60-80 ft-lbs) and retighten after the first heat cycle. Check alignment carefully during installation - misaligned pipes are the leading cause of premature joint failure and exhaust leaks.