Wehrli

Wehrli Custom Fabrication, operating from a 112,000-square-foot facility in Sandwich, Illinois, has built a reputation since 2010 as a premier manufacturer of custom-fabricated diesel performance components. Founded by Jason Wehrli with his three brothers and employing over 50 dedicated craftsmen, WCFab combines motorsports passion with American manufacturing excellence, producing every component in-house from CNC machining through powder coating.

GM Duramax Platform Expertise

LB7 Duramax (2001-2004.5):

  • 4-inch intake kits for factory turbo applications with dry air filters and Outerwear pre-filter covers
  • Stage 2 intake kits featuring 3.5-inch turbo inlet horns
  • High-flow intake bundle packages including 3-inch fabricated Y-bridges, cold and hot side intercooler pipes
  • Twin CP3 conversion components including valley block-off plates and fuel pressure relief valve delete kits
  • S300 single turbo installation kits capable of 750+ horsepower
  • Fuel rail fittings with ported high-flow design for improved rail pressure consistency

LLY Duramax (2004.5-2005):

  • Complete high-flow intake systems with MAF sensor provisions
  • Billet exhaust manifolds replacing restrictive factory cast components
  • Driver-side 2-inch stainless up-pipes with HD bellows that eliminate OEM cracking issues
  • Turbo compressor inlet flanges and O-ring seal kits

LBZ/LMM Duramax (2006-2010):

  • Stage 2 intake kits with 4-inch intake pipes and 3.5-inch turbo inlet horns
  • Y-bridge assemblies with improved end tank designs
  • Upper coolant pipe replacements eliminating failure-prone rubber OEM hoses
  • Twin turbo 4-inch downpipes for compound turbo setups with T6 flanges
  • Transfer case braces for high-horsepower applications reducing driveline flex

LML Duramax (2011-2016):

  • 4-inch intake systems with OEM IAT sensor compatibility
  • 3-inch hot side intercooler pipes delivering 7% improved airflow over stock
  • Turbo resonator billet block-off plates
  • Upper coolant pipes with custom powder coating options
  • CP4.2 to CP3 conversion support hardware
  • VGT turbo heat blankets and gasket kits
  • 750+ horsepower built transmissions with lifetime warranty against bending or breaking
  • Allison 1000 transmission support braces and AAM 11.5-inch rear differential covers

L5P Duramax (2017-2025):

  • 4-inch cast aluminum high-flow turbo intake horns for 2017-2024 Silverado/Sierra 2500/3500 HD
  • 3.5-inch downpipes with black ceramic coating and heat wrap, no tuning required
  • Billet exhaust manifolds with EGR riser flanges enhancing turbo spool and lowering EGTs
  • Fuel filter relocation kits for 2017-2019 short/long bed and 2020-2024 long bed configurations
  • OEM placement coolant tank kits with billet aluminum caps
  • Stealth STR drop-in VGT turbo upgrades for 2024-2025 models

Ford Powerstroke Applications

6.0L Powerstroke (2003-2007):

  • 4-inch intake kits designed for factory turbo configurations
  • Custom powder-coated components in multiple signature colors
  • Billet aluminum thermostat housings replacing failure-prone plastic OEM parts

6.4L Powerstroke (2008-2010):

  • High-flow intake systems optimized for twin-turbo architecture
  • 3-inch hot side intercooler pipe upgrades with silicone boots and stainless T-bolt clamps

6.7L Powerstroke (2011-2025):

  • Complete traction bar kits with 60-inch and 68-inch options for various cab/bed configurations
  • Lifetime warranty against bending or breaking to original purchaser
  • Poly bushings at axle mounts with RockJock Johnny Joints at frame connections
  • Grade 8 hardware with epoxy primer base coat powder coating
  • Billet aluminum oil fill cap replacements matching WCFab coolant tank and brake reservoir caps

7.3L Powerstroke (1994-2003):

  • Universal traction bar applications
  • Custom fabricated support components

3.0L Powerstroke (2018-2021):

  • Specialized intake and intercooler components for light-duty diesel applications

Dodge/Ram Cummins Lineup

5.9L Cummins 24-Valve (1998.5-2007):

  • 4-inch intake kits with MAF sensor mounting hardware for OEM-style turbochargers
  • High-flow intake horns and intercooler pipe combinations delivering 60% greater flow than stock
  • 3.5-inch intake horn and matching intercooler pipe assemblies
  • S400/Stock compound twin turbo kits capable of 1000+ RWHP depending on configuration
  • S475/Stock combinations for 750 RWHP with superior turbo spool characteristics
  • S480 variants for 800-1000+ RWHP applications
  • Upper aluminum coolant pipes replacing OEM rubber hoses in custom powder coat finishes
  • Coolant bypass kits for manual and automatic transmissions with stainless steel braided lines
  • T4 spacer plates with ceramic coating, M10 studs and gaskets
  • Oil feed lines with -6AN fittings and flexible Teflon hose construction

6.7L Cummins (2007.5-2025):

  • 5-inch intake kits with air box enclosures drawing cold air through inner fender and ram air grille ducts
  • Fabricated aluminum construction with smooth aerodynamic bends improving intake velocity
  • Removable air box lids for easy filter inspection with hydrophobic pre-filter covers
  • 4-inch shorty downpipes mating to exhaust V-band connections
  • S400 single turbo installation kits with complete oil feed/drain assemblies
  • Fabricated coolant tanks with low coolant level sensors, sight glass, and black anodized billet caps
  • Upper coolant pipe assemblies replacing failure-prone OEM plastic Y-pipes
  • HE351VE turbo upgrades for 2007.5-2009 applications
  • Brake reservoir covers in TIG-welded fabricated aluminum

Nissan Titan 5.0L Cummins (2016-2019):

  • Custom intake and turbo upgrade components

Signature Powder Coating Options

WCFab houses powder coating operations under the same roof as manufacturing, offering an extensive palette including WCFab Red, WCFab Grey, Bengal Red, Bengal Blue, Candy Teal, Illusion Purple, Fluorescent Orange, Fluorescent Green, Gloss Black, Gloss White, and custom color matching. All components receive epoxy primer base coat for durability, with typical lead times of 3-5 business days for stock colors and 10-15 business days for custom finishes.

Chassis and Drivetrain Reinforcement

  • Universal 60-inch and 68-inch traction bar kits for Ford, Dodge, and GM HD leaf spring suspensions
  • AAM 11.5-inch rear differential covers with aluminum fabrication, stainless hardware, and fill plugs
  • Allison 1000 transmission support braces connecting rear housing to transfer case
  • Heavy-duty engine mount kits for square body swaps (1973-1987 GM C/K chassis)
  • ARP stainless steel fastener kits for critical mounting points

CNC-Machined Billet Components

  • Oil fill caps for Duramax, Powerstroke, and Cummins in black or clear anodized finishes
  • Brake reservoir caps with o-ring seals and machined cam lock engagement
  • Coolant tank caps rated 18-20 PSI with black anodized construction
  • IAT sensor bungs with M10x1.25 thread pitch for custom intake applications
  • Turbo compressor inlet flanges for drop-in VGT turbo conversions
  • High-flow fuel rail fittings drastically improving fuel delivery over OEM

Powersports and Side-by-Side (SxS) Applications

Expanding beyond pickup platforms, Wehrli offers performance components for UTVs and powersports applications, maintaining the same commitment to quality fabrication and American manufacturing that built their diesel reputation.

Installation and Fitment

Most WCFab products feature plug-and-play installation utilizing OEM mounting points, requiring only basic hand tools. Comprehensive installation instructions accompany each kit, with technical support available from experienced staff. Products undergo rigorous quality control before shipping from the Illinois facility, with typical turnaround of 3-5 business days for in-stock items and 9-11 weeks for custom or build-to-order turbo kits.

Wehrli Custom Fabrication represents the intersection of motorsports heritage and precision manufacturing, where every intercooler pipe, traction bar, and intake horn carries the WCFab logo as a badge of American craftsmanship and diesel performance excellence.