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Wehrli Custom Fabrication - WCFab » 2003, Chevrolet / GMC, 6.6L Duramax
Products for:
- Year: 2003
- Make: Chevrolet / GMC
- Model: 6.6L Duramax
View Universal items for: 2003 Chevrolet / GMC 6.6L Duramax
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Description: - Yields 3 inches of front lift
- Cognito Ball Joint SM Series Upper Control Arm Kit
- Torsion Bar Adjuster Key Kit
- Fox 2.0 Performance Series Monotube Front Shocks
- Fox 2.0 Performance...More Details »
Item #: 110-P0753
Condition:
New
Price: $1,659.70
Description: - Yields 4-inches of front lift
- Cognito Block and U-Bolt Kit yields 2-inches of rear lift
- Fox 2.0 Performance Series IFP Monotube Front and Rear Shocks
- Maintains Adequate Droop Travel for...More Details »
Item #: 110-P0785
Condition:
New
10-15 Business Days Lead Time for Powder Coat
$120 Flat Rate LTL Freight Shipping On Cognito Lift Kits - Lower 48 States Only - Appears as Handling Charge during checkout
Free Ground Shipping
Price: $3,344.16
Description: - Yields 6-inches of front lift
- Cognito Block and U-Bolt Kit yields 4-inches of rear lift
- SM Series Ball Joint Upper Control Arms
- Fox 2.0 Performance Series IFP Shocks
- Maintains...More Details »
Item #: 110-P0970
Condition:
New
10-15 Business Days Lead Time for Powder Coat
$120 Flat Rate LTL Freight Shipping On Cognito Lift Kits - Lower 48 States Only - Appears as Handling Charge during checkout
Free Ground Shipping
Price: $4,144.06
Description: -Driver Upper Control Arm
-Passenger Upper Control Arm
-Ball Joint x2
-Bushing x8
-Crush Sleeve x4
-Hardware Pack
Item #: 110-90290
Condition:
New
10-15 Business Days Lead Time for Powder Coat
Price: $629.95
Description: - Premium Forged Torsion Leveling Key Kit
- Includes shock extensions
- Max Lift 2.5" in.
- Max Tire Diameter 33 in.
- Fits 2wd/4wd 2000-2010 Silverado 1500/2500 HD 8-lug. 2wd/4wd 2000-2012...More Details »
Item #: 66-3050
Condition:
New
Price: $249.95
Description: WCFab recommends Chemical Guys Hybrid V07 Optical Select High-Gloss Spray Sealant and Quick Detailer to clean, protect, and maintain our gloss single and two coat custom powder finishes
Item #: WAC_808_16
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $19.99
Description: WCFab recommends Chemical Guys Meticulous Matte Detailer to clean, protect, and maintain our Frost powder coat finishes
Item #: SPI_995_16
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $13.99
Description: - 2oz. treats 25 gallons of diesel fuel
- Highest Lubricity additive on the market
- Beat 17 competitors in HFRR test
- Highest Level “A” rating in NACE Corrosion Test
- Protects against...More Details »
Item #: E09 00004, E09 00006
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $6.00
Description: - 1oz. treats 8 gallons of diesel fuel
- Prevents fuel line freeze ups down to -40 degrees Fahrenheit
- Lowers pour point to -65 degrees Fahrenheit
- Lowers cold filter plugging point by 20...More Details »
Item #: E09 00014, E09 00016
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $5.00
Description: - Recommended for trucks with stock or basic bolt on parts
- Comprehensive, state-of-the-art, multi-gauge/tuner touch-screen display
- 3rd Generation design is faster and more capable than ever...More Details »
Item #: 85400-200
Condition:
New
50 State Compliant CARB E.O. D-802-13
Price: $749.95
Description: All Clean+ is a versatile all-purpose cleaner that cuts through all levels of dirt, grease, and grime with the power of natural citrus inside, outside, or even underneath your vehicle!
Item #: CLD_101_16
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $11.99
Description: Observe and understand your vehicle parameters using Edge state-of-the-art technology. The Edge Insight CTS3 delivers unmatched monitoring capability for any OBD II vehicle (1996 or newer). This...More Details »
Item #: 84130-3
Condition:
New
Price: $511.95
Description: FASS Fuel Systems Extended Length Extreme Water Separator Filter
Item #: XWS3002XL
Condition:
New
Price: $32.30
Description: FASS Fuel Systems Extended Length Particulate Filter (PF3001XL)
Item #: PF3001XL
Condition:
New
Price: $23.75
Description: FASS FUEL SYSTEMS XWS-3002 EXTREME WATER SEPARATOR (XWS-3002)
NEW MORE EFFICIENT EXTREME WATER SEPARATOR IS RATED @ 2 MICRONS ABSOLUTE. THE REASON OUR WATER SEPARATOR NO LONGER HAS A DRAIN IS...More Details »
Item #: XWS-3002
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $29.45
Description: FASS Fuel Systems Fleet Filter Pack XL
Item #: FLP3000XL
Condition:
New
Price: $168.15
Description: FASS Fuel Systems Filter Pack XL
Item #: FP3000XL
Condition:
New
Price: $56.05
Description: FASS FUEL SYSTEMS PF-3001 PARTICULATE FILTER (PF-3001)
NEW PARTICULATE FILTER IS RATED @ 144 MICRONS. THE 144 MICRON PARTICULATE FILTER ON THE SUCTION SIDE WILL DRASTICALLY REDUCE CAVITATION,...More Details »
Item #: PF-3001
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $20.90
Description: FASS FUEL SYSTEMS DIESEL FUEL TITANIUM SERIES ELECTRIC HEATER KIT (HK-1001)
Item #: HK-1001
Condition:
New
Free Ground Shipping
Price: $160.55
Description: FASS TITANIUM/TITANIUM SIGNATURE SERIES DUAL ELECTRIC HEATER KIT SPLITTER
Item #: HKS-1001
Condition:
New
Price: $37.05
NEW!
Description: - NOW ACCEPTING PRE-ORDERS!
- Set of 4 High Strength Forged Aluminum Wheels
- 17 in. diameter x 8.5 in. width (1 inch taller and 2 inches wider than a factory PY0 wheel)
- +18 offset / 5.5...More Details »
Item #: WCF100585
Condition:
New
Limited Supply
EXPECTED SHIP DATE APRIL 30th, 2026 FOR PRE-ORDER CUSTOMERS. Please allow additional 10-15 business day lead time for custom powder coat finishes.
NOW ACCEPTING PRE-ORDERS!
Free Ground Shipping
Price: $3,196.00
Sale: $2,876.00
Save: 10%
Save: $320.00
Description: - Goerend Allison Aluminum Pan for 5 & 6 Speed Transmissions
- Billet aluminum filter lock
- Genuine Allison Transmission Filter
- Magnetic drain plug with copper sealing ring
- Pan Bolts &...More Details »
Item #: A-PAN-A1000-KIT
Condition:
New
Price: $319.00
Description: - Allows for removal of the stock rear bumper
- Made from strong and durable 18 gauge steel
- Black EDP coated for corrosion protection during transport and ready to prime and paint after a light...More Details »
Item #: BHP5000
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $169.00
Description: - Replaces failure prone plastic factory GM Heater Core Firewall Coolant Fitting
- Billet direct-fit replacement with 5/8" barb connection
- More resistant to heat and vibration
- Double O-ring...More Details »
Item #: WCF100155
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $42.00
Description: - CNC Machined Billet Cap is a direct OEM Replacement not a cover
- Includes new diaphragm seal
- Made in USA
- Black Anodized Finish
- Installs in seconds
- Compatible with LB7, LLY, LBZ, LMM, LML, and L5P Duramax Equipped Trucks
Item #: WCF100216
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $45.00
Description: - CNC Machined Billet Cap is a direct OEM Replacement not a cover
- Includes new diaphragm seal
- Made in USA
- Clear Anodized Finish
- Installs in seconds
- Compatible with LB7, LLY, LBZ, LMM, LML, and L5P Duramax Equipped Trucks
Item #: WCF100215
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $45.00
Description: - LED Pods: 2x (One Pair) Morimoto 1Banger
- Choose From HXB Combo, Spot, Wide, or Flood in White or Yellow
- 2 in. Wide x 2 in. High x 2.5 in. Deep
- Brackets: 2x Standard Bottom Mount Brackets...More Details »
Item #: BAF098
Condition:
New
Price: $240.00
NEW!
Description: For individuals who tow, race, or simply run their diesel hard, proper cooling of your transmission fluid is one of the most important things that you can do to prolong the life of your...More Details »
Item #: 124060000
Condition:
New
Price: $329.99
Description: - EFI Live TCM Tuning for Allison 1000 5 Speed Transmissions
- Better Acceleration
- Quicker Shifts
- Prevents short shifting in performance use
- Improved Torque Converter lock up strategy
-...More Details »
Item #: DT1110010008000
Condition:
New
This Product cannot ship to the state of California
Free Ground Shipping
Price: $300.00
Description: - EMISSIONS INTACT 50 State Legal Custom Performance Tuning
- California Legal!
- Add up to +100 RWHP & +180 lb/ft TQ to your Duramax
- Includes CARB EO Sticker
- Single Tune Options Available:...More Details »
Item #: DT8110010001000
Condition:
New
50 State Compliant CARB EO D-845 #11-10, D-845 #11-11
Free Ground Shipping
Price: $300.00
NEW!
Description: The LB7 (2001-2004) DT1000 - BUILT TRANSMISSION is designed for 2001, 2002, and 2003 Chevy Silverado or GMC Sierra Duramax Trucks being pushed to extreme performance levels. Great for those that...More Details »
Item #: DT1000-LB7-5 / DT1000-LB7-6
Condition:
New
Built to order.
Ships truck freight. Liftgate service option is required for destination addresses without a forklift or ability to unload from a semi-trailer. Will Call Pickup at our facility is also available.
Price: $9,950.00
NEW!
Description: The LB7 (2001-2004) DT550 - BUILT TRANSMISSION WITH TORQUE CONVERTER is designed for 2001, 2002, 2003, and 2004 Chevy Silverado or GMC Sierra Duramax. Great for those that daily drive their truck,...More Details »
Item #: DT550-LB7-5-TQC / DT550-LB7-6-TQC
Condition:
New
In stock ships in 3-5 business days.
Ships truck freight. Liftgate service option is required for destination addresses without a forklift or ability to unload from a semi-trailer. Will Call Pickup at our facility is also available.
Price: $5,500.00
NEW!
Description: The LB7 (2001-2004) DT750 - BUILT TRANSMISSION WITHOUT TORQUE CONVERTER is designed for 2001, 2002, and 2003 Chevy Silverado or GMC Sierra Duramax Trucks. Great for those that are building the...More Details »
Item #: DT750-LB7-5 / DT750-LB7-6
Condition:
New
In stock ships in 3-5 business days.
Ships truck freight. Liftgate service option is required for destination addresses without a forklift or ability to unload from a semi-trailer. Will Call Pickup at our facility is also available.
Price: $6,145.00
NEW!
Description: Required for tune selection when running our switchable (SOTF) 6.6L LB7 Duramax performance tuning on 2001-2004 model year trucks
Includes:
- Rotary SOTF Tune Selection Switch with Knob
- Switch Position Label / Face Plate
- Wire Conduit
Item #: 1101A020
Condition:
New
In Stock, ships in 3-5 Business Days.
This Product cannot ship to the state of California
Price: $40.00
NEW!
Description: Required for tune selection when running our switchable (SOTF) 6.6L LB7 Duramax performance tuning on 2001-2004 model year trucks
Includes:
- Keylock SOTF Tune Selection Switch with 2 Keys
-...More Details »
Item #: keylockblue
Condition:
New
In Stock, ships in 3-5 Business Days.
This Product cannot ship to the state of California
Price: $65.00
Description: - Fully TIG Welded 11 GA Stainless Steel Construction
- Heavy Duty 2" Driver Side Up Pipe
- Heavy Duty 2" Passenger Side Up Pipe
- Up Pipe Gaskets (4)
- Made in USA
Item #: WCF100590
Condition:
New
In Stock. Ships in 3-5 business days.
This Product cannot ship to the state of California
Price: $639.00
Description: - Fully TIG Welded 11 GA Stainless Steel Construction
- Heavy Duty 2" Driver Side Up Pipe
- Heavy Duty 2" Passenger Side Up Pipe Passenger Side Up Pipe for Compound / Twin Turbo Applications
-...More Details »
Item #: WCF100589
Condition:
New
In Stock. Ships in 3-5 business days.
This Product cannot ship to the state of California
Price: $639.00
Description: - Flows 40% Better than Stock
- True 4" Inlet Turbo Intake with smooth flowing transition to turbo compressor cover for optimized airflow and drivability
- Precision CNC Machined Cast Aluminum...More Details »
Item #: WCF100535
Condition:
New
WCFab Red, WCFab Grey, Gloss Black, and Gloss White in stock ships in 3-5 business days. All other colors 10-15 Business Day Lead Time
This Product cannot ship to the state of California
Price: $179.00
Description: - 4" Intake Pipe
- 14g Aluminum Construction
- Air Box & Lid Constructed of 10G Aluminum Sheet
- Dry Air Filter
- Outerwear's Pre-Filter Cover
- Includes Installation Hardware
- 4" Intake...More Details »
Item #: WCF100300
Condition:
New
WCFab Red, WCFab Grey, Gloss White, and Gloss Black in stock and ships in 3-5 business days. 10-15 business day lead time on
other colors.
This Product cannot ship to the state of California
Price: $639.00
Description: - MAP Sensor Bung / Weld Fitting for Custom Fabricated Intercooler Piping
- CNC Machined Billet Aluminum
- Made in USA
Item #: WCF205-35
Condition:
New
In Stock. Ships in 3-5 business days.
Price: $30.00
Description: - Fully TIG Welded, CNC machined billet steel exhaust manifolds
- Fully TIG Welded 11 GA Stainless Steel Construction Heavy Duty Up Pipes
- Manifolds finished in Black Ceramic Coat rated for...More Details »
Item #: WCF100174
Condition:
New
In Stock. Ships in 3-5 business days.
This Product Cannot Ship to the State of California
Price: $1,929.00
Description: -3" Driver Side Intercooler Pipe
-14g Mandrel Bent Aluminum Construction
-Silicone Boots
-T-Bolt Clamps
-Powder Coating
-No tuning required
Item #: WCF100349
Condition:
New
WCFab Red, WCFab Grey, and Gloss Black in stock and ships in 3-5 business days. 10-15 business day lead time on other colors.
This Product cannot ship to the state of California
Price: $315.00
Description: - EMISSIONS INTACT Custom Performance Tuning
- Add up to +100 RWHP & +180 lb/ft TQ to your Duramax
- Single Tune Options Available:
- Heavy Tow (8K lbs to GVWR)- +40 RWHP, +72 ft-lbs
- Light...More Details »
Item #: DT1110010001009
Condition:
New
This Product cannot ship to the state of California
Free Ground Shipping
Price: $300.00
Description: - 100% Drop in Replacement (Federal Emissions vehicles ONLY, does not fit California delivered vehicles)
- Includes a Fleece Performance LB7 High Flow Intake Horn and installation kit
- No Core Charge!
- Supports up to 625 RWHP
Item #: FPE-LB7-63
Condition:
New
Ships in 3-5 business days. 10-15 business day lead time for powder and ceramic coat options.
This Product cannot ship to the state of California
Price: $1,999.00
Description: - Cupless injector bore - no injector cups to leak again ever!
- New aluminum casting
- New valves, valve guides, new springs, and new valve seals
- CNC cut, multi-angle valve job
Item #: FPE-61-10001-D-CL, FPE-61-10001-P-CL
Condition:
New
This Product cannot ship to the state of California
Price: $1,199.00
Description: - Minimizes air restriction and flow better than stock
- Fully enclosed airbox that protects the filter from dirt and keeps out engine heat
- Available in either 8-layer Cotton Cleanable or Dry Extendable media
Item #: 75-5101, 75-5101D
Condition:
New
This Product Cannot Ship to the State of California
Price: $379.00
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 100% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-100SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $4,357.60
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 150% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-150SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $4,794.40
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 200% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-200SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $5,044.00
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 250% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-250SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $5,938.40
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 30% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-30SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $3,546.40
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 300% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-300SAC
Condition:
New
Please Call for Availability
This Product Cannot Ship to the State of California
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 350% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-350SAC
Condition:
New
Please Call for Availability
This Product Cannot Ship to the State of California
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 400% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-400SAC
Condition:
New
Please Call for Availability
This Product Cannot Ship to the State of California
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 45% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-45SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $3,546.40
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 450% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-450SAC
Condition:
New
Please Call for Availability
This Product Cannot Ship to the State of California
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 500% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-500SAC
Condition:
New
Please Call for Availability
This Product Cannot Ship to the State of California
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 65% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-65SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $3,660.80
Description: -8 LB7 New Bosch SAC Style Injectors
-Modified 80% flow over OEM
-Copper Washers
-O-rings
Item #: LB7-80SAC
Condition:
New
This Product Cannot Ship to the State of California
Price: $4,024.80
Description: -8 LB7 New SAC00 Bosch Injectors
-Copper Washers
-O-rings
-Increased fuel injector lifespan
-50 State Legal - CARB compliant (EO number D-756-2)
-Stock fuel delivery, no calibration required...More Details »
Item #: LB7-00SAC
Condition:
New
CARB compliant (EO number D-756-2)
Price: $2,712.00
