HSP Diesel Max Flow Mouthpiece (For Aftermarket 4" Intakes) - 04.5-10 Chevrolet/GMC - Kingsport Grey

Product Name: HSP Diesel Max Flow Mouthpiece (For Aftermarket 4" Intakes) - 04.5-10 Chevrolet/GMC - Kingsport Grey
Manufacturer: HSP Diesel
Manufacturer Part #: 003-4-HSP-DG
Thoroughbred Diesel Part #: HSP003-4-HSP-DG

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

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 1/2" 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 1/2" 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

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.

HSP Diesel Max Flow Mouthpiece Features:

• Cast-aluminum, CNC-machined construction for high durability and precision
• Significantly increases airflow compared to the restrictive factory mouthpiece
• 4.5" main inlet transitions smoothly to your 4" aftermarket intake
• Integrated O-ring flange prevents unfiltered air leaks
• Includes 1/2" NPT port at PCV location (plug included)
• Designed specifically for trucks running a 4" LBZ-style or aftermarket intake system
• Improves turbo efficiency, throttle response, and overall engine performance
• For more information on HSP Diesel call us at 1-859-737-4966

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.