Shop 5 Inch Semi-Truck Exhaust Stacks

Explore 5-inch exhaust stacks in miter, slant, curved, and bullhorn designs. Crafted from durable stainless steel and chrome, these stacks offer both style and longevity. Available lengths range from 24 to 72 inches to fit your ride. Kits like the Powerflow Diesel Dual Stack help redirect exhaust safely. For performance or style, find the best 5-inch exhaust stacks at 4 State Trucks!

5 Inch Semi-Truck Exhaust Stacks

Ready to give your big rig a bold upgrade? Our 5-inch semi-truck exhaust stacks aren’t just about style—they're about making a serious statement while improving performance under the hood. Whether you're chasing a classic-looking, polished exhaust stack or you just want to boost airflow and durability, you’re in the right place.

Why Run 5" Exhaust Stacks on Your Semi?

Exhaust stacks move hot gases up and out of the cab area instead of under the trailer. That keeps heat and fumes away from your driveline—and from you. It also frees up space under the chassis, which is especially useful if you're running a custom setup or auxiliary systems.

What Does a Bigger Pipe Size Do for Your Truck?

Stepping up to a 5-inch exhaust stack can help reduce back pressure. That means your engine doesn’t have to work as hard to push exhaust out—so you get improved efficiency, smoother performance, and a deeper, throatier sound that turns heads at every stoplight. It’s the perfect balance of airflow and tone.

4-Inch vs. 5-Inch Exhaust Stacks—What's the Difference?

Great question. A 4-inch stack looks cleaner and more compact—ideal for tighter builds or classic restorations. But if you want bigger visuals, louder sound, and freer flow, 5-inch stacks are where it’s at. They’ve got that oversized, heavy-hauler vibe and can better support modified or high-horsepower engines.

What If the Exhaust Pipe is Too Small?

Simple—your engine chokes. A restricted exhaust can build backpressure that robs power and fuel efficiency. That’s why many owner-operators go with larger stacks and smooth-bend elbows to keep airflow high and resistance low.

What Increases Flow Rate in a Stack?

It’s a combo of things: pipe diameter, smooth mandrel bends, straight-through mufflers (or no muffler at all), and polished inner walls. The smoother and straighter the path, the faster those gases move—and the more power your engine keeps. Find the Perfect Style Option: - Miter Cut: sharp, angled tops with a classic big-rig silhouette. - Curved: directs fumes backward for a cleaner cab experience. - Flat Top: sleek and bold with no fuss. - West Coast Turnout: bends outward to the side for a regional signature look. - Bull Hauler: wide, aggressive, and impossible to miss. - Straight Stack: raw and to the point—just chrome and flow.

Chrome-Polished & Built for the Long Haul

Shop for 5-Inch Exhaust Stack Tops at 4 State Trucks

These stacks are chrome-polished for a sleek-looking exterior that can match your other aftermarket add-ons, from heavy-duty front-bumpers, fenders, and hood trim to blind-mount visors and heat sleeve wraps. Our 5-inch stacks have your back

Frequently Asked Questions About 5 Inch Semi-Truck Exhaust Stacks

What materials are 5 inch exhaust stacks made from, and which is best for my truck?

Most 5 inch exhaust stacks come in either 304 stainless steel or chrome-plated steel. Stainless steel stacks offer superior corrosion resistance and typically last 8-10 years with minimal maintenance, making them ideal for trucks operating in harsh weather conditions or coastal areas. Chrome-plated stacks provide a mirror-like finish at a lower initial cost but require regular polishing and may show pitting after 3-5 years. For trucks running in northern states with heavy road salt exposure, we recommend 304 stainless steel despite the higher upfront investment.

Will a 5 inch stack fit my truck, and what adapters might I need?

A 5 inch stack will fit most Class 8 trucks including Peterbilt, Kenworth, Freightliner, Volvo, and International models from 1990 to present. However, you'll need to verify your current exhaust outlet size. If your truck has a 4 inch system, you'll need a 4-to-5 inch exhaust adapter. For trucks with DPF/DEF systems (2007 and newer), ensure you select stacks designed for aftertreatment compatibility, which typically feature a longer straight section before any bends. Measure from your exhaust outlet to any obstructions to confirm you have at least 24 inches of clearance for proper stack installation.

How difficult is it to install 5 inch stacks, and what tools do I need?

Installation typically takes 2-4 hours per stack for someone with basic mechanical skills. You'll need a socket set (typically 9/16" and 5/8"), exhaust clamps, high-temp exhaust sealant, and potentially a sawzall if trimming is required. The most common challenge is aligning the stack properly while tightening clamps - having a helper makes this much easier. West Coast-style stacks with built-in elbows are generally easier to install than straight stacks that require separate elbows. Always use grade 8 clamps rated for diesel exhaust temperatures, not standard muffler clamps from auto parts stores.

What's the difference between curved, straight, and miter-cut stacks?

Straight stacks provide maximum exhaust flow and the classic long-haul look, typically extending 36-48 inches above the mounting point. Curved stacks angle away from the cab at 15-30 degrees, directing exhaust away from the trailer and reducing cab soot buildup - especially important for flatbed operators. Miter-cut stacks feature angled tops (usually 15 or 30 degrees) that create a more aggressive appearance and can help prevent rain intrusion. Bull hauler styles combine a straight lower section with a curved top. Your choice depends on both aesthetics and practical needs - reefer units often benefit from curved stacks to keep exhaust away from the refrigeration unit.

How do I prevent my 5 inch stacks from discoloring or rusting?

Even stainless steel stacks will develop a golden-brown discoloration near the base due to extreme heat - this is normal and doesn't indicate a quality issue. To maintain appearance, clean stacks every 2-3 weeks using a dedicated stainless steel or chrome polish (depending on material). Never use abrasive pads on chrome stacks. For stainless, a purple metal polish works well for removing heat discoloration. Apply a high-temp wax after cleaning to extend time between polishing. If you notice rust spots on stainless stacks, these are typically from road debris embedding in the surface - remove with a stainless steel cleaner and fine steel wool. Chrome stacks showing rust or pitting have compromised plating and will need replacement within 6-12 months.