2004.5-2010 Chevy Silverado/GMC Sierra 2500/3500 6.6L Duramax Diesel 3" Downpipe Exhaust System - Compatible with LLY/LBZ/LMM Models (Direct Bolt-On, No Welding)
2004.5-2010 Chevy Silverado/GMC Sierra 2500/3500 6.6L Duramax Diesel 3" Downpipe Exhaust System - Compatible with LLY/LBZ/LMM Models (Direct Bolt-On, No Welding)
Description:
- High-performance 3-inch downpipe exhaust for 2004.5–2010 Chevy Silverado/GMC Sierra 2500/3500HD (LLY/LBZ/LMM 6.6L Duramax).
- Replaces restrictive factory downpipe for better exhaust flow, turbo response, and power.
- Made of durable stainless steel with mirror polish finish.
- Reduces backpressure for improved turbo efficiency and boost potential.
- Not compatible with Cab & Chassis trucks.
Key Features:
- 3" diameter design for superior airflow.
- Direct fit for LLY, LBZ, and LMM engines.
- Bolt-on installation (professional recommended).
Fitment:
- Chevy Silverado 2500/3500 (6.6L Duramax Turbo Diesel) – 2004.5–2010
- GMC Sierra 2500/3500 (6.6L Duramax Turbo Diesel) – 2004.5–2010
Note:
- OEM replacement part.
- Verify vehicle compatibility before ordering.
Couldn't load pickup availability
Quick Info
🚚 Shipping Policy
✔ FREE shipping to 48 states (excl. AK/HI/territories)
⏳ 6-9 business days (1-day processing +5-8 business day transit)
📦 Tracking emailed after shipment
❗ Report damaged/lost items within 48 hours
📅 No shipping on major holidays
🔄 Returns & Refunds
✔30-day returns– Unused items in original packaging
✔Free returnsfor defective/wrong items (we cover shipping)
📦Customer pays return shippingfor non-defective items
⚠Non-returnable: Opened seals, custom-made parts
💰Refunds issuedwithin 14 days of return
🇺🇸48 states only(no international returns)
🛡️Warranty & Claimers
🛡️ 2-Year Limited Warranty
✔ Covered: Manufacturing defects, cracks, weld failures (2 years from delivery)
✖ Not Covered: Install errors, accidents, corrosion, modifications, racing abuse
⚠ Off-Road Use Only - Not EPA/CARB compliant for street vehicles
FAQ
🔧 TECHNICAL INQUIRIES 🔧
━━━━━━━━━━━━━━━━━━━━━━━
🔍 1. CARB Certification Status
❓ Are your exhaust manifolds CARB certified?
📌 Currently not CARB certified
⚠️ Limited to off-highway use only
📍 California users assume compliance risk
━━━━━━━━━━━
⚡ 2. Cracked Manifold Risks
❓ Can a cracked exhaust manifold cause other engine problems?
✔️ Yes - multiple potential issues:
• Exhaust leaks
• Reduced backpressure
• Oxygen sensor errors
• Engine overheating
🛠️ Recommendation: Immediate replacement
━━━━━━━━━━━
🏎️ 3. Performance Installation
❓ Can I install a performance exhaust manifold without tuning?
🔄 Possible but not ideal
⚠️ May trigger P0171 "lean condition" code
💡 Pro Tip: ECU tuning recommended for optimal airflow
━━━━━━━━━━━
🧼 4. EGR Valve Maintenance
❓ Should I clean or replace a clogged EGR valve?
🔧 Mild cases: Cleaning may suffice
🔄 Severe buildup: Requires replacement
⛔ Stuck stems: Won't regain full function
━━━━━━━━━━━
🌡️ 5. EGR Cooler Failure
❓ What causes failure and how to spot it?
🔥 Common causes:
- Coolant contamination
- Carbon blockage
🚨 Warning signs:
✓ White exhaust smoke
✓ Coolant loss
✓ Milky oil residue
Precision & Durability
Handcrafted Fish Scale Welding
Our 304 stainless steel auto parts feature artisan fish scale welding – a signature technique that ensures:
✔ Stronger Seams – Overlapping weld beads enhance structural integrity
✔ Leak-Proof Performance – Ideal for high-pressure exhaust systems
✔ Distinctive Finish – Each ripple showcases skilled craftsmanship
Durable & Corrosion-Resistant
304 Stainless Steel Auto Parts
Upgrade your ride withrust-resistant 304 stainless steel– perfect for exhaust systems, chassis, and custom builds. Durable, sleek, and weatherproof.
Attention
⚠️ Off-Road/Racing Use Only – Not CARB/EPA compliant. Installation on street vehicles violates federal and state laws. Buyer assumes all liability.