Take your 2015–2016 LML 6.6L Duramax to the next level with this 4" downpipe-back DPF & CAT delete exhaust system. Designed for heavy-duty applications, it removes factory flow restrictions to unlock stronger performance and more efficient exhaust output.
Upgrade your truck with this 6.6 LML Duramax DPF delete exhaust system from Vigor Diesel. Designed as a high-flow 4" Downpipe-Back exhaust, it replaces the restrictive factory DPF to improve exhaust flow, reduce back pressure, and deliver a stronger diesel sound.
Constructed from 2mm thick T-409 stainless steel, offering superior heat resistance and a longer lifespan than the original aluminized system.
Removing the original DPF and catalytic converter reduces back pressure; a hardware upgrade alone can boost 24 horsepower and 38 lb-ft of torque; with ECU tuning, up to 150 horsepower can be added.
A clear exhaust system prevents heat buildup. This system can reduce exhaust temperatures by up to 220°F (122°C), protecting turbochargers and engine components and extending their lifespan.
No need to clean/replace the DPF ($500-$1000 annually), no need to add diesel exhaust fluid (DEF), and no wasted fuel due to regeneration; projected savings of up to $26,000 over 300,000 miles.
Unleash the distinctive whine of a diesel turbocharger and improve turbo response.
| Feature | Factory Exhaust | Vigor Diesel Upgrade |
|---|---|---|
| Exhaust Path | Restricted by DPF and CAT | Straight-through high-flow design |
| Engine Response | Slower throttle response | Faster turbo spool |
| Heat Management | Higher exhaust heat | Up to 220°F lower EGT |
| Power Potential | Limited airflow | +24 hp / +38 lb-ft hardware gains |
| Exhaust Sound | Muted | Deeper diesel tone with turbo whistle |
This 6.6 Duramax DPF delete exhaust system fits:
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