FITMENT
- 2011-2015.5 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine with a V-Band Clamp.
- Does NOT Fit 2015.5-2016 models equipped with the 3-bolt flange. Please check underneath your truck!
- Please physically inspect underneath your truck to verify your turbo discharge style before purchasing!
DESCRIPTION
Product Overview
- 6.6L Duramax LML trucks, DPF backpressure heat-soaks the turbo, while combined EGR soot and CCV oil vapor bake into a flow-choking sludge across intake valves and intercooler lines.
- This LML Performance Upgrade Kit eliminates all three bottlenecks at once. Combining free-flowing exhaust hardware, an EGR delete, and a CCV reroute, it slashes EGTs, restores turbo response, and keeps your intake tract completely sludge-free.
Key Features
- Secures to early-build trucks via the V-band clamp, aligning seamlessly with the factory downpipe connection.
- Replaces the factory DPF and CAT with a 4" performance pipe and an integrated high-flow muffler to eliminate harsh tones and highway drone.
- Fully deletes the EGR and reroutes the CCV to keep harmful soot and oil mist out of your turbo and intercooler.
- Bundles the exhaust, EGR, and CCV installations into a single job, saving time and labor costs around the tight rear engine bay.
FAQ
Q: What performance benefits can I expect after installing this 4-inch high-flow exhaust system?
A: By completely eliminating exhaust flow restrictions, backpressure drops dramatically. You will experience faster turbo spool-up, reduced turbo lag and noticeable horsepower and torque gains across the RPM band.
Q: Will this 4-inch exhaust kit fit directly on a 2015.5–2016 Duramax truck?
A: No, if you are replacing the front turbo downpipe simultaneously, you must verify whether your downpipe interface uses the early 3-bolt flange or the 2015.5+ V-band clamp connection.
Q: Is the ECU tuning required for a 2015.5–2016 model different from a 2011–2014 truck?
A: Yes. The Engine Control Module (ECM) hardware and software definitions changed for the 2015.5 and 2016 model years. When writing your custom race tune (via EFI Live or EZ Lynk), ensure the tuner specifies a 2015.5–2016 LML tune file to avoid flash errors or Check Engine Lights.
Q: How do I identify if my 2015 truck is an "Early 2015" or a "2015.5" model?
A: Check the build date sticker inside the driver-side door jamb. Trucks built between July 2014 and February 2015 are generally Early 2015 models. Trucks built in March 2015 or later are 2015.5 models, which typically include the updated center console layout and integrated factory exhaust brake controls.
