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HSP Diesel S400 Down Pipe - Ceramic Coated - for 2001-2016 GM Duramax 6.6L LB7/LLY/LBZ/LMM/LML

Was: $319.00
Sale: $303.05
Save: 5%
Save: $15.95



The HSP S400 Single Kit Downpipe is constructed from 3.5'' aluminized steel and built to last. Each downpipe is built in quality fixtures to ensure proper fitment. This downpipe allows great fire wall clearance and can be made to work with the factory transmission dipstick tube, but our HSP dipstick tube will provide the necessary room for a simple install.

Shown in image above with Optional Ceramic coating

Note: This product is specified for HSP's S400 install kit, however, it may work with other aftermarket applications depending on pedestal height. HSP cannot guarantee proper fitment with other manufacturers components.

Note: This does NOT fit stock turbos or dop in stock replacements

Note: Works with most pedestals - Use of HSP Pedestal is recommended for best fitment


  • Lower Exhaust gas temperatures
  • Ceramic coating option for heat control
  • CNC machined flanges
  • Mandrel bend tube for increased strength and flow
  • Improve exhaust tone
  • Two piece design allows for easy installation
  • 4'' lower section for increased flow and easy transition to your existing exhaust


  • 3.5'' upper downpipe section
  • 4'' lower downpipe section
  • (1) L40AA-Exhaust Clamp
  • (1) 4” Quick Release V-Band
  • (1) 3.5” Accuseal Band Clamp

Compatible with: 

  • LB7: 01-04 VIN Code 1
  • LLY: 04.5-05 VIN Code 2
  • LBZ: 06-07 VIN Code 2 or D
  • LMM: 07.5-10 VIN Code 7
  • LML: 11-16 VIN Code 8


Shipping Information

  • Item Requires Shipping
  • 20.0 lbs.
  • W16.0000” x H10.0000” x L24.0000”

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