HSP Diesel Max Flow Intake Mouthpiece For 2004.5-2010 Chevrolet And GMC LLY / LBZ / LMM Duramax With 4IN Aftermarket Intakes

HSP Turbo Inlet Max Flow Mouthpiece for 2004.5–2010 Chevrolet / GMC Duramax LLY / LBZ / LMM (for 4” Aftermarket Intakes)

The factory turbo inlet mouthpiece not only lacks style — it also restricts airflow and limits your engine’s power potential. The HSP Max Flow Mouthpiece solves both issues using a cast-aluminum, CNC-machined design engineered for durability, airflow, and improved sealing. Featuring an integrated O-ring flange to prevent unfiltered air leaks and a ½” NPT port in the PCV location, this mouthpiece ensures that your aftermarket intake system is not held back by a restrictive OEM component. The 4.5” inlet guarantees maximum flow before reducing to your 4” aftermarket intake.

Included Components

• 1x 4.5” Max Flow Mouthpiece
• 1x ½” NPT Plug
• 1x 4.5” to 4” Reducer Boot (for 4” aftermarket intakes)
• 1x 4.5” Stainless Steel T-Bolt Clamp
• 1x 4” Stainless Steel T-Bolt Clamp
• 1x O-Ring Seal

Vehicle Fitment

• LLY: 2004.5–2005 (VIN Code 2) with 4” LBZ-style aftermarket intake
• LBZ: 2006–2007 (VIN Code 2 or D) with 4” aftermarket intake
• LMM: 2007.5–2010 (VIN Code 6) with 4” aftermarket intake

Special Fitment Notes

• This mouthpiece will not fit with factory air intake systems.
• For HSP Intakes, please see 003-HSP.

How to Identify VIN Code

The engine code is determined by the 8th character of the VIN number.
The model year is identified by the 10th character.

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we believe in our products and stand firmly behind every one that leaves our facility. For years, we've gone above and beyond for our customers — even without a formal policy. With the HSP “No BS” Limited Lifetime Warranty, that same commitment is now set in stone, providing clarity, dependability, and support throughout ownership.

For more information about our Lifetime, No BS Warranty, click HERE.