Upgrading the exhaust on your L5P Duramax isn’t just about chasing horsepower—it’s about improving flow, protecting your trailer, and cleaning up the look of your truck. Whether you're towing heavy loads or just want something better than factory, a DPF-back exhaust system is a smart investment.
Size That Actually Matters
The stock DPF-back exhaust on the L5P necks down to a restrictive 2.85" at the tailpipe. That choke point builds unnecessary backpressure and limits performance.
The Banks Monster Exhaust System solves this with a full 5" constant-diameter mandrel-bent design, increasing flow by 192% and reducing post-DPF backpressure by up to 85% compared to stock. The result is more efficient exhaust evacuation, improved throttle response, and better overall performance.
Pro Tip: There’s no major horsepower difference between 4" and 5" systems—but 5" gives you a cleaner look and less restriction at the tip.
Protect Your Trailer
The factory tip on the L5P is poorly placed and not heat-shielded. It vents high-temperature exhaust directly at your trailer tongue or wiring harness—especially during regeneration cycles—putting you at risk of melted wires, scorched paint, or fried electrical components.
The Banks system fixes this with a patented 6.5" × 7.5" “SideKick” ob-round tip. Designed to deflect hot gases away from your trailer, it also reduces tailpipe temperature by up to 15% during regen—improving safety while towing and extending the life of your trailer connections.
If you're just looking to reposition the exhaust and clean up the tip, PPE offers a budget-friendly Turn Out Tip that replaces the final section and changes the exit angle without a full system swap.
Better Sound Without the Drama
Because the DPF and factory emissions components stay intact, there’s no major sound increase when upgrading to a Banks or PPE system. Instead, you get a deeper, more refined tone that sounds clean—not loud or obnoxious.
You’re not going to wake the neighbors, but you’ll definitely know it’s not stock.
Quick Install. Long-Term Payoff.
Installing a DPF-back exhaust system is straightforward and requires minimal tools:
- One cut behind the DPF
- Bolt-on assembly with included hangers and clamps
- Fits trucks with all cab and bed configurations, duallys, and aftermarket airbag systems
- Total install time: ~1.5 hours
No welding. No surprises.
Why We Recommend the Banks Power Monster Exhaust
If you’re looking for the most complete, well-engineered DPF-back system for your 2017–2019 L5P, this is it. Here’s why the Banks Monster Exhaust System stands out:
- Full 5” constant-diameter mandrel-bent tubing
- 85% less backpressure vs. stock
- 192% more flow area than the factory tip
- 15% lower tailpipe temps during regen
- Trailer-safe SideKick tip with patented design
- High-temp Cerakote black or chrome tip (won’t blue or brown)
- Fits DCSB, DCLB, CCSB, CCLB, including dually models
- Installs in about 1.5 hours
- Comes with a 1-year limited warranty
The Bottom Line
The factory exhaust tip isn’t just ugly—it’s a performance bottleneck and a towing liability. Upgrading to a quality DPF-back system like the Banks Monster Exhaust cleans up your rear end, improves safety, and reduces restriction.
Better flow. Safer towing. Cleaner style.
It’s a no-brainer for L5P owners.
