6.6L Duramax Downpipe-Back Race Exhaust for 2011-2015 Silverado/Sierra HD - Fits 2500/3500 Models | Mandrel-Bent Construction
ℹ️ DESCRIPTION
Maximize your Duramax's performance with this competition-ready stainless steel exhaust system. Features 5" mandrel-bent stainless steel high-flow design that reduces backpressure and eliminates restrictive factory DPF & CAT emissions components. Improves turbo response, lowers EGTs during heavy towing, and delivers an aggressive diesel sound with straight-through design.
| Specification | Detail |
| Construction | 5" Mandrel-Bent Stainless Steel |
| System Type | Downpipe-Back Exhaust System |
| Installation | Direct bolt-on fitment with OE-style hangers |
| Emissions | DPF & CAT delete - eliminates restrictive factory components |
| Performance Benefits | Reduces backpressure, lowers EGTs, improves turbo response |
| Sound | Aggressive diesel sound with straight-through design |
| Requirements | Requires ECU tuning. For off-road/racing use only. |
🔍 Fitment:
| Vehicle Model | Years | Engine |
|---|---|---|
| Chevrolet Silverado 2500HD/3500HD | 2011-2015 | 6.6L Duramax LML |
| GMC Sierra 2500HD/3500HD | 2011-2015 | 6.6L Duramax LML |
📜 POLICY
🚚 Ships from nearest warehouse within 1 business day, arrives in 5-8 days（most area in 7 days）
🔄 30-day return policy
🔧 2-year replacement warranty
Note:
🔖 Contact Us First: If you encounter any issues with your order, please reach out to us immediately. We're committed to resolving any concerns quickly and to your satisfaction.
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📮 Contact Email: support@samexhaust.com
Attention
Products on this site are for off-road/racing use only and are not legal for public roads where emissions laws apply.
Professional installation recommended. Removing emissions equipment (DPF, CAT, SCR, DOC) requires deleting related sensors and a compatible tuner to avoid engine codes.
Performance gains may vary—no guarantees.