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Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7
Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7 Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7 Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7 Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7 Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7

Wehrli High Flow Stage 3 Intake Bundle Kit, 2001-2004 LB7

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WARNING: Cancer and Reproductive Harm -
Part#: WCF100712

Wehrli Stage 3 High Flow Intake Bundle Kit

Fits 2001-2004 LB7 Duramax w/Federal Emissions ONLY

Part# WCF100712

WC Fab products are special order, please allow an additional 15+ business days before shipment


*This product is ONLY designed for closed course racing where it is legal to do so. Any other use will be in violation of local, state, and federal laws. We are not responsible for unlawful use of this product.*


Wehrli stage 3 upgrade for the 2001-2004 LB7 Duramax combines our Stage 1 High Flow Bundle, Stage 2 Intake Kit, and 3" Down Pipe into a single package providing increased airflow for your turbo and engine for improved efficiency, throttle response, and turbo spool up. This kit replaces the restrictive OEM LB7 Y-Bridge, passenger side intercooler pipe, and driver side intercooler pipe with a high flow, 3” mandrel bent aluminum piping kit feeding WCFab's signature TIG welded, CNC machined billet y-bridge base to help increase throttle response, turbo spool up, and reduce EGTs by creating a full 3" intake tract between your turbo and engine. The high flow, fabricated aluminum intake pipe and air box enclosure with dry filter assembly replaces the restrictive plastic factory parts on your diesel for improved engine performance. All new design significantly increases air flow to your turbo producing improved horsepower and torque, quicker throttle response, and cooler intake temperatures by drawing cold air through the inner fender. All aluminum construction features large diameter 4" piping with smooth aerodynamic bends to improve intake air velocity, volume, and provide more aggressive engine and turbo sound during acceleration. Removable air box lid element allows for easy visual inspection and maintenance of your WCFab filter with included hydrophobic pre-filter cover, to help keep your MAF sensor, turbo, and engine airways contaminant free. Includes High Flow 3.5 in. Turbo Intake Horn which removes restrictions in the OEM setup to improve turbo spool and top end power. This High Flow 3.5 in. horn is fully compatible with OEM and upgraded drop in IHI style turbochargers. Kit includes upgraded high quality silicone boots that withstand higher pressures and temperatures than the failure prone, angled factory parts to increase reliability and help eliminate boost leaks. Includes Fuel Pressure Regulator Valve (FPRV) Block Off Kit to allow proper clearance to larger diameter Y-Bridge assembly. The 3" High Flow Down Pipe is a straight shot compared to the crushed spots and curves on the factory down pipe, which helps improve exhaust flow and reduces under hood temps. Finished in Black Ceramic Coat with Heat Wrap. Full assembly finished in your choice of WCFab's signature custom powder coat colors for a look as unique as your truck. Save up to $127.00 versus buying components individually.


  • 3" Fabricated Billet Y-Bridge
  • 3" Passenger (Cold) Side Intercooler Pipe
  • 3" Driver (Hot) Side Intercooler Pipe
  • 4" Intake Pipe
  • 14g Aluminum Construction
  • Air Box with Lid
  • Dry Air Filter
  • Outerwear's Pre-Filter Cover
  • 3 1/2" Intake Horn
  • Silicone Boot & Stainless Steel T-Bolt Clamps
  • O-Ring Seal
  • 3" Turbo Downpipe Compatible with OEM and Aftermarket IHI Style Turbos
  • Silicone Boots
  • Stainless Steel T-Bolt Clamps
  • Hardware and Gaskets
  • Powder Coating

This Kit Includes Part#'s:

  • WCF100693
  • WCF100636
  • WCF100349
  • WCF100119


  • This kit is designed for off road competition use only!
  • Will NOT fit with Banks Intercoolers!
  • This is a custom order part. Once the order has been processed it CANNOT be canceled, returned, or refunded.
  • If you enter a powdercoat color that is not listed on the chart, your order will be delayed as we will have to contact you to discuss the options. RAW Finish is NOT available!
  • Not recommended for us with S300 or S400 Style Turbochargers.

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