Sinister Diesel 2004.5-2005 Duramax, Cold Air Intake – SD-CAI-LLY


Product Highlights:

Give a real boost to your truck’s performance and save on fuel using this Sinister Diesel Duramax LLY cold air intake. It has been designed, engineered, and fabricated by Sinister Diesel itself, ensuring excellent quality. All kits come with silicone couplers designed for durability, plus all mounting hardware.

Use this cold air intake for your Chevy or GMC 2004.5-2005 6.6L Duramax engine. The aluminum tubing features CNC mandrel bending for smooth airflow and excellent durability. The Signature Sinister Blue powder coat looks great and helps combat corrosion. You also receive a reusable cotton filter, eliminating the need to constantly be buying new air intake filters.

Vehicle Fitment

2004.5-2005 GM Duramax LLY 6.6L

Key Features

  • Precision CNC Mandrel Bent Aluminum Tubing for a Perfect Fit
  • Oversized Long Lasting Reusable Cotton Filter Media
  • Significantly Improved Throttle Response and Turbo Spool-up
  • Great for Daily Driving, Towing or Race Day
  • Perfect When Paired With a Sinister Diesel Exhaust or Tuner
  • Polished and Powder Coated in our Signature Sinister Blue
  • Easy, Drop-In Installation with Basic Hand Tools and Minimum Experience


  • CNC Mandrel Bent Aluminum Intake Tube
  • Reusable Cotton Media Filter
  • Installation Hardware

*Special Order. Please allow for additional shipping time.

Patent Pending