3″ Turbo Outlet Downpipe Exhaust for 2001-2004 GMC/Chevrolet 6.6L Duramax LB7
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- Ships from SPELAB
---tab Description---
The 3″ Turbo Outlet Downpipe is a direct-fit upgrade for the 2001–2004 Chevrolet 6.6L LB7 Duramax. Engineered to replace the restrictive OEM pipe, it improves exhaust flow, lowers backpressure, and reduces EGT. Made from 201 stainless steel, its 3″ straight-through design boosts turbo response and efficiency. Installs easily using factory flanges—no welding or tuning needed.
Features
3‑Inch Straight‑Through Design – Provides 20‑25% more flow area than the stock flattened oval pipe, dramatically improving exhaust velocity and reducing turbo lag.
Lower EGT & Reduced Backpressure – Helps maintain cooler exhaust temperatures under heavy loads, ideal for towing and high‑demand driving.
Direct OE Fitment – Uses factory flange dimensions and bolt holes for a straightforward, no‑weld installation.
Included Heat Shield Wrap – Minimizes radiant heat transfer to the engine bay, protecting wiring, brake lines, and firewall components.
Enhanced Sound & Throttle Response – Delivers a deeper, more aggressive exhaust tone while improving drivability and turbo spool character.
No Tuning Required – Works with the stock ECU.
Note:
For off‑road/competition use only. Not CARB or EPA certified.
---tab Fitment---
2001-2004 Chevrolet Silverado 2500 HD 6.6L Duramax LB7
2001-2004 Chevrolet Silverado 3500 6.6L Duramax LB7
2001-2004 GMC Sierra 2500 HD 6.6L Duramax LB7
2001-2004 GMC Sierra 3500 6.6L Duramax LB7
---tab Shipping & Returns---
Fast Shipping Policy
Your order will be dispatched within 1-2 business days , and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 14-day free return , which means you don't have to pay for a return slip. Click for Return Policy
---tab Description---
The 3″ Turbo Outlet Downpipe is a direct-fit upgrade for the 2001–2004 Chevrolet 6.6L LB7 Duramax. Engineered to replace the restrictive OEM pipe, it improves exhaust flow, lowers backpressure, and reduces EGT. Made from 201 stainless steel, its 3″ straight-through design boosts turbo response and efficiency. Installs easily using factory flanges—no welding or tuning needed.
Features
3‑Inch Straight‑Through Design – Provides 20‑25% more flow area than the stock flattened oval pipe, dramatically improving exhaust velocity and reducing turbo lag.
Lower EGT & Reduced Backpressure – Helps maintain cooler exhaust temperatures under heavy loads, ideal for towing and high‑demand driving.
Direct OE Fitment – Uses factory flange dimensions and bolt holes for a straightforward, no‑weld installation.
Included Heat Shield Wrap – Minimizes radiant heat transfer to the engine bay, protecting wiring, brake lines, and firewall components.
Enhanced Sound & Throttle Response – Delivers a deeper, more aggressive exhaust tone while improving drivability and turbo spool character.
No Tuning Required – Works with the stock ECU.
Note:
For off‑road/competition use only. Not CARB or EPA certified.
---tab Fitment---
2001-2004 Chevrolet Silverado 2500 HD 6.6L Duramax LB7
2001-2004 Chevrolet Silverado 3500 6.6L Duramax LB7
2001-2004 GMC Sierra 2500 HD 6.6L Duramax LB7
2001-2004 GMC Sierra 3500 6.6L Duramax LB7
---tab Shipping & Returns---
Fast Shipping Policy
Your order will be dispatched within 1-2 business days , and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 14-day free return , which means you don't have to pay for a return slip. Click for Return Policy
SPELAB Auto Parts: 1 year from delivery; supplier conditions apply. SPELAB offers a one-year limited warranty from delivery for material/workmanship defects under normal use, original purchaser only, with proof of purchase. Consumables, wear/cosmetic damage, improper installation, alteration, misuse and removal/installation labor are excluded. Approved remedies are repair, replacement or replacement parts at SPELAB’s discretion.
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
SPELAB Auto Parts warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
- Return eligibility
- SPELAB allows return requests within 30 days of delivery, with authorization and undamaged goods, original packaging and accessories. Tuners are final sale. Customer pays voluntary return shipping; original shipping is not refunded. SPELAB pays return shipping for approved damaged, incorrect or manufacturing-defective items. Transit damage must be reported within two business days and incorrect items within seven days. Based on what SPELAB Auto Parts offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- SPELAB Auto Parts
- Warranty duration
- 1 year from delivery; supplier conditions apply
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- SPELAB Auto Parts
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.