Frequently Asked Questions About Freightliner M2 Business Class Chrome Stacks-Tops

What are the differences between straight cut, curved, and miter cut stack tops for my M2?

Straight cut tops provide a classic, no-nonsense look with a flat 90-degree angle cut. Curved (or turnout) tops angle the exhaust away from your truck at 15-30 degrees, helping direct smoke and soot away from your cab and trailer. Miter cut tops feature an angled cut (typically 15-45 degrees) for a more aggressive appearance while still directing exhaust upward. Most M2 owners prefer curved tops for practical soot management, especially if hauling refrigerated trailers or flatbeds where exhaust staining is a concern.

Will these chrome stack tops fit my specific year Freightliner M2, and what size do I need?

Most chrome stack tops are designed to fit 5-inch diameter exhaust stacks, which is standard on Freightliner M2 Business Class trucks from 2003-present. However, some older models (pre-2003) may have 4-inch stacks. To verify your size, measure the outside diameter of your current stack or exhaust pipe. Stack tops typically use a clamp-on design that accommodates slight variations, but getting the correct base size (4-inch or 5-inch) is critical for proper fit and preventing exhaust leaks.

How difficult is installation, and what tools will I need?

Installation typically takes 15-30 minutes per stack and requires basic hand tools. You'll need a socket wrench set (usually 9/16" or 5/8"), a flat-head screwdriver for the clamp, and possibly WD-40 or penetrating oil if removing old stack tops. Most chrome tops use a band clamp system - simply slide the top over your existing stack, position it where desired, and tighten the clamp evenly. No cutting or welding is required. Some installers recommend applying high-temp exhaust sealant to the inside of the clamp area for extra security.

How long will the chrome finish last, and what maintenance is required?

Quality chrome stack tops feature triple-chrome plating over steel and typically maintain their shine for 3-5 years with proper care. In harsh winter climates with road salt, expect 2-3 years. To maximize lifespan, wash with soap and water monthly, polish with chrome cleaner quarterly, and avoid harsh chemicals or abrasive pads. Many drivers apply a thin coat of WD-40 or chrome wax before winter to protect against salt corrosion. Heat discoloration near the base is normal and won't affect performance.

Will adding chrome stack tops affect my exhaust flow or engine performance?

Properly sized chrome stack tops will not restrict exhaust flow or impact engine performance. They're designed to maintain the same internal diameter as your existing exhaust system. However, avoid tops with built-in rain caps or flappers, as these can create minor backpressure. If you're concerned about rain entering the stacks, choose curved or angled tops instead, which naturally deflect moisture while maintaining full exhaust flow. Some drivers report slightly different exhaust notes with certain styles, but no measurable performance changes.