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About ICT Billet
ICT Billet was born from a passion for LS swaps. After tackling our first swap in 2001, we saw the need for better parts and reliable information. In 2014, we launched ICT Billet to provide high-quality, American-made parts that simplify and enhance LS and LT swaps.
We’re dedicated to supporting car enthusiasts with precision-engineered products, detailed installation guides, and world-class service. Thank you for choosing ICT Billet—your partner in making exceptional builds a reality.
ICT Billet Duramax Turbo Diesel Mouth Piece Resonator Noise Reduction Plug Cover Cap 6.6L Seal Billet Aluminum Made in America ICT Billet 551503
Duramax Resonator Large Plug
ICT Billet Duramax Turbo Diesel 2004.5-10 LBZ LLY LMM Mouth Piece Resonator Noise Reduction Plug Cover Cap 6.6L Seal Billet Aluminum Made in America ICT Billet Duramax Resonator Large Plug
- Required when removing bulky resonator "noise-reduction" box from the intake tube
- Compatible with; 2004.5 to 2010 Duramax LLY LBZ LMM 6.6L ONLY
- Made in the USA from aerospace grade billet aluminum
- Includes: 1 "Mouth Piece" Resonator plug w/ Orings
- Satin Aluminum Finish for durability and corrosion resistance
Premium USA Produced Materials
Our parts are crafted from premium-grade materials, sourced and produced right here in the USA. Designed by experts in our state-of-the-art facility, we use cutting-edge American-made equipment to ensure unmatched quality and durability.
Exceptional Quality
At ICT Billet, quality is our standard. Every part we produce is crafted with precision using advanced manufacturing technologies in our USA facility. Our commitment to excellence ensures unmatched reliability and performance for your engine swap.
Innovation in Development
At ICT Billet, precision is key. Using advanced technology, we laser-scan vehicles to create solid models for perfect fitment every time. Our commitment to research and development ensures our products work seamlessly from the start.
Proudly American Made
Keeping jobs in America is our priority. We use USA-made materials, belt tensioners, metric flange bolts, pulleys, and more. Our focus on American manufacturing means reliable products you can trust.
Your Complete LS Swap Shop
From engine mounts to wiring, ICT Billet is your one-stop shop for LS swaps. We provide everything you need to make your swap smooth, efficient, and professional.
SEMA Proud, SEMA Strong
As a proud member of SEMA, we are part of an elite group of automotive manufacturers. Our dedication to quality and innovation sets us apart, delivering products you can depend on.
Charlie H.
Reviewed in the United States on February 16, 2025
Works well, gets rid of the resonator, and makes the turbo a little more present. I like it for the price and installation was a breeze.
John martinez
Reviewed in the United States on September 14, 2024
Fit perfect on my 07 6.6l lbz and made the engine bay look a lot better
Nathan Greenway
Reviewed in Canada on December 29, 2024
perfect on my 2008 LMM duramax
Chase Prokopchuk
Reviewed in Canada on November 9, 2024
Does what it says
only1
Reviewed in the United States on January 13, 2024
Good fit installed on LLY. Lubed up the O-rings with a little oil and it went right in.
Krywko
Reviewed in Canada on September 9, 2020
Fit just like the description, easy install on my 2008 LMM Duramax.
Frank Davidson
Reviewed in Canada on December 2, 2020
Very easy to install
Matthew M.
Reviewed in the United States on October 30, 2020
Nice cheap mod to clean up the engine bay. Noticed a slight difference in sound and the Turbo was a good bit louder on my straight piped truck.
Customer
Reviewed in the United States on September 23, 2019
No noticable improvements other than looks and cleans up the engine compartment. Thought there might be a sound change but nothing. Not a waste of money but other than looks seems to really not add any value.
Customer
Reviewed in Canada on July 16, 2019
Perfect fit for my LBZ
Buddy b.
Reviewed in the United States on May 27, 2019
Put it on my LBZ DURAMAX 2006 took 15 minutes to install .. I used dielectric grease and worked it in very tight fit . Very happy cleaned up the engine bay and price was good ..
John M
Reviewed in the United States on October 23, 2019
Fit my 2004.5 LLY perfectly. Make sure and lube the o-rings before installing them and then lube the plug to make easier installation and not tear the rings. Very pleased and looks nice and clean under the hood.
Francis X. Fanucci
Reviewed in the United States on November 29, 2017
This is more a decorative item then anything else. It allows you to eliminate the resonator. In some of my research of Duramax diesel LLY engines I find it was no uncommon for the resonator to break apart and pieces were drawn into the engine via the turbo. This will cause some serious engine damage. So in my mind it's cheap protection in case the resonator did start breaking up. I would recommend applying some grease or oil to the rubber "O" rings to make it easier to install. Since purchasing the plug I have replaced the turbo mouth piece and don't need the plug anymore.
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