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USD 270.63 270.63 294.88
Part #:

Wehrli Custom Fab WCF100355 3" Cold Side Intercooler Pipe

Vehicle Fitment:
2004.5-2005 GM 6.6L Duramax LLY | See full application list below
Part #:
★★★★★ ★★★★★ 2 Reviews
FROM 270.63
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The Wehrli Custom Fab WCF100355 3" Cold Side Intercooler Pipe from XDP is an ideal upgrade for your your 2004.5-2005 GM 6.6L Duramax LLY. Replace the restrictive 2.5" factory tube with a 3" high flow, mandrel bent, 14-gauge aluminum one piece pipe.Designed to improve airflow between the turbo and engine for improved efficiency, throttle response, and turbo spool up. This part uses upgraded silicone boots to withstand higher boost pressures than the factory components. This helps increase reliability and eliminate weak points in the factory design that can lead to boost leaks or complete failures in hard working and high-performance applications. Boot connection is straight at the intercooler unlike the angled factory boot connection.

This pipe is compatible with stock trucks requiring no additional modifications, upgrades, or tuning for installation. Installs easily with basic hand tools. Finished in your choice of custom powder-coat colors for long lasting durability and to stand out under the hood of your Silverado/Sierra HD.

  • Mandrel-Bent Tubing
  • 3" Cold Side Intercooler Pipe
  • Flows 56% Better Than Stock
  • 14 Gauge Aluminum Construction
  • Compatible With OEM Y-Bridge/Cross Over Pipe
  • NO Tuning Required, Complete Bolt-On Installation
  • Fits Stock Truck No Additional Modifications Or Upgrades Needed
  • Available In A Wide Variety Of Durable Custom Powder-Coat Finishes
  • OEM Clip Ring Design Replaced By High Quality Silicone Boot And Stainless Steel T-Bolt Clamps For Improved Sealing And The Ability To Hold Higher Boost Pressures Without Leaking
  • Made In USA

2004.5-2005 Chevrolet Silverado 2500HD (6.6 Duramax LLY)
2004.5-2005 Chevrolet Silverado 3500HD (6.6 Duramax LLY)
2004.5-2005 GMC Sierra 2500HD (6.6 Duramax LLY)
2004.5-2005 GMC Sierra 3500HD (6.6 Duramax LLL)
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Not Compatible With Banks Intercoolers

Vehicle Fitment

2004.5 Chevy 6.6L LLY Duramax
2005 Chevy 6.6L LLY Duramax
2004.5 GMC 6.6L LLY Duramax
2005 GMC 6.6L LLY Duramax

Product Options

WCF100355-BB Bengal Blue
WCF100355-BC Bronze Chrome
WCF100355-BR Bengal Red
WCF100355-CB Candy Blue
WCF100355-CP Candy Purple
WCF100355-CR Candy Red
WCF100355-CT Candy Teal
WCF100355-FB Flat Black
WCF100355-FTB Fine Texture Black
WCF100355-GB Gloss Black
WCF100355-GRY WCFab Grey
WCF100355-GW Gloss White
WCF100355-IP Illusion Purple
WCF100355-RED WCFab Red
WCF100355-SGB Semi-Gloss Black


  • ID 129675
  • Manufacturer Name Wehrli Custom Fab
  • Shipping Weight 6.00 lb.
  • Shipping Length 32 in.
  • Shipping Width 12 in.
  • Shipping Height 12 in.
  • Fuel Type Diesel
  • E-Code 4
  • Warranty Info 1 Year
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Cross Reference # 15188720, 15188721, 15198168
  • Internal LR


★★★★★ ★★★★★
2.5/5 Stars out of 2 Reviews
Verified Buyer
2004.5 duramax
Looks pretty, great bargain, wrong part, came dented (not chipped, so might have happened at shop. Well packaged in foam, so not in transit. Kinda disappointed as the mechanic will have to charge me twice to get it installed.?
Verified Buyer
05 duramax cold side
Xtreme Diesel gets a 5/5, Wherli gets a 3/5. They sent the wrong boot, the fitment was extremely tight, and it had a bend at the open side of it. I fixed the bend cause you’ll never see it and it’s under the boot. I Didn’t wanna wait for another one. New boot came in a couple days

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