PPE 304 Stainless Steel Free-Flow Down Pipe – 2011–2015 Chevy/GMC Duramax LML
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
Description
Description
Part Number: 117000600
GTIN: 840171210323
OEM Reference: GM 12643610
CARB EO Number: D-701-30
Upgrade Your Duramax’s Breathing Power
The stock LML down pipe is one of the most restrictive parts of your exhaust system. It makes a sharp turn right off the turbo flange and even has dents in the piping that choke flow (seriously, who thought that was a good idea?). The result? Higher EGTs, sluggish turbo response, and lost horsepower.
The PPE Free-Flow Down Pipe fixes all that. Built from 3-inch 304 stainless steel, this high-flow design gives your turbo the path it deserves; smooth, unrestricted, and durable enough to outlast your truck. Plus, it comes wrapped in a woven titanium heat sleeve to keep under-hood temps down where they belong.
Key Features
-
304 Stainless Steel Construction – Built tough for long life and corrosion resistance.
-
Lower EGTs & Better Turbo Response – Frees up horsepower your stock down pipe is holding back.
-
TIG-Welded Flanges – Leak-free, precision-built connections that hold up to serious boost.
-
Smooth, Free-Flowing Design – No dents, no restrictions, just clean flow.
-
Titanium Heat Sleeve Included – Protects engine bay components and manages temps.
-
Sensor-Friendly – Retains factory ports (2x M20-1.5 & 1x M14-1.5).
-
Fits Factory or PPE Up-Pipes – A true drop-in upgrade.
Vehicle Compatibility
-
2011–2015 Chevy/GMC Duramax LML
Note: Only fits models with a clamp-style connection to the exhaust pipe.
Added Value
-
3-Year Limited Warranty
-
30-Day Returns
-
FREE Shipping on orders $100+
Why Upgrade to PPE’s Free-Flow Down Pipe?
If you’re after cooler EGTs, snappier turbo spool, and a stronger stainless steel design that won’t rust out like stock, this down pipe is a no-brainer. Whether you’re towing, daily driving, or chasing horsepower goals, PPE’s high-flow design unlocks performance your LML has been missing.
