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PPE 117000600 – 3" 304 Stainless Steel High-Flow Downpipe for 2011–2015 LML Duramax
Upgrade the most restrictive part of your LML exhaust. The factory downpipe uses a crushed oval, crimped design with an abrupt turn right off the turbo. That chokes flow, raises EGTs, and slows spool. PPE’s 3-inch mandrel-bent 304 stainless steel downpipe replaces it with a smooth, round, unrestricted path.
Why it matters
- Lower EGTs and better turbo efficiency
- Quicker spool and improved response
- Reduced backpressure for more usable power and torque
- Deeper, throatier exhaust note
- Better heat control under the hood
Built from corrosion-resistant 304 stainless with TIG-welded, fully machined flanges for a leak-free fit. It retains the factory sensor ports (2× M20-1.5 and 1× M14-1.5) so OEM sensors and injectors stay in place. A woven titanium heat sleeve, secured with stainless clamps, helps keep under-hood temperatures down.
Key features
- 3" mandrel-bent 304 stainless steel construction
- Smooth, full-diameter flow path (no oval crush or indentations)
- TIG-welded, machined upper and lower flanges
- Woven titanium heat wrap with stainless clamps
- Factory sensor/injection ports retained
- Compatible with stock or PPE up-pipes
- CARB EO D-701-30 — 50-state legal
- Direct bolt-on replacement (OEM ref. GM 12643610)
- 3-year manufacturer warranty
Fitment 2011–2015 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD with 6.6L Duramax LML.
Important: This part is for V-band / clamp-style connections. Early 2015 trucks typically use the V-band. Later 2015 trucks with a 3-bolt triangular flange need PPE 117000700. Verify your flange before ordering.
A simple, high-quality drop-in that lets the LML breathe the way it should.
PPE 117000600 – 3" 304 Stainless Steel High-Flow Downpipe for 2011–2015 LML Duramax
Upgrade the most restrictive part of your LML exhaust. The factory downpipe uses a crushed oval, crimped design with an abrupt turn right off the turbo. That chokes flow, raises EGTs, and slows spool. PPE’s 3-inch mandrel-bent 304 stainless steel downpipe replaces it with a smooth, round, unrestricted path.
Why it matters
Lower EGTs and better turbo efficiency
Quicker spool and improved response
Reduced backpressure for more usable power and torque
Deeper, throatier exhaust note
Better heat control under the hood
Built from corrosion-resistant 304 stainless with TIG-welded, fully machined flanges for a leak-free fit. It retains the factory sensor ports (2× M20-1.5 and 1× M14-1.5) so OEM sensors and injectors stay in place. A woven titanium heat sleeve, secured with stainless clamps, helps keep under-hood temperatures down.
Key features
3" mandrel-bent 304 stainless steel construction
Smooth, full-diameter flow path (no oval crush or indentations)
TIG-welded, machined upper and lower flanges
Woven titaniu[...]
PPE 117000600 – 3" 304 Stainless Steel High-Flow Downpipe for 2011–2015 LML Duramax
Upgrade the most restrictive part of your LML exhaust. The factory downpipe uses a crushed oval, crimped design with an abrupt turn right off the turbo. That chokes flow, raises EGTs, and slows spool. PPE’s 3-inch mandrel-bent 304 stainless steel downpipe replaces it with a smooth, round, unrestricted path.
Why it matters
- Lower EGTs and better turbo efficiency
- Quicker spool and improved response
- Reduced backpressure for more usable power and torque
- Deeper, throatier exhaust note
- Better heat control under the hood
Built from corrosion-resistant 304 stainless with TIG-welded, fully machined flanges for a leak-free fit. It retains the factory sensor ports (2× M20-1.5 and 1× M14-1.5) so OEM sensors and injectors stay in place. A woven titanium heat sleeve, secured with stainless clamps, helps keep under-hood temperatures down.
Key features
- 3" mandrel-bent 304 stainless steel construction
- Smooth, full-diameter flow path (no oval crush or indentations)
- TIG-welded, machined upper and lower flanges
- Woven titanium heat wrap with stainless clamps
- Factory sensor/injection ports retained
- Compatible with stock or PPE up-pipes
- CARB EO D-701-30 — 50-state legal
- Direct bolt-on replacement (OEM ref. GM 12643610)
- 3-year manufacturer warranty
Fitment 2011–2015 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD with 6.6L Duramax LML.
Important: This part is for V-band / clamp-style connections. Early 2015 trucks typically use the V-band. Later 2015 trucks with a 3-bolt triangular flange need PPE 117000700. Verify your flange before ordering.
A simple, high-quality drop-in that lets the LML breathe the way it should.