Sinister Diesel Cold Air Intake for 2004.5–2005 Chevy/GMC 6.6L Duramax LLY

Upgrade your 2004.5–2005 Chevy or GMC 6.6L Duramax LLY with a Sinister Diesel Cold Air Intake. CNC mandrel-bent aluminum tubing provides a smooth airflow path, while an oversized reusable cotton-media filter offers a serviceable alternative to disposable filters.

Whether your truck handles daily driving or towing duty, this intake combines durable silicone couplers with a signature Sinister Blue finish for a coordinated under-hood look. Designed, engineered and fabricated by Sinister Diesel, it offers drop-in installation using basic hand tools.

Key features

• Precision CNC mandrel-bent aluminum intake tubing.
• Oversized reusable cotton-media air filter.
• Durable silicone couplers.
• Polished and powder-coated in signature Sinister Blue to help resist corrosion.
• Designed to improve throttle response and turbo spool-up.
• Drop-in installation with basic hand tools.

Vehicle fitment

2004.5–2005 Chevy/GMC 2500 and 3500 with the 6.6L Duramax LLY diesel engine.

Confirm the LLY engine designation before ordering.

What's included

• CNC mandrel-bent aluminum intake tube.
• Reusable cotton-media air filter.
• Silicone couplers.
• Installation hardware.