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Ships within 48 hours · Estimated delivery Aug 18 - Aug 23
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Description
Wehrli Custom Fab WCF100191-GRY 4" Intake Kit W/Air Box - WCFab GreySwap the intake in your GM Silverado Sierra 6. 6L Duramax today with the Wehrli Custom Fab WCF100191 GRY 4" Intake Kit W Air Box WCFab Grey from GAP. This 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. This design significantly increases airflow to your turbo producing improved horsepower and torque, quicker
Swap the intake in your GM Silverado/Sierra 6.6L Duramax today with the Wehrli Custom Fab WCF100191-GRY 4" Intake Kit W/Air Box - WCFab Grey from GAP. This 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. This design significantly increases airflow 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. High-quality hardware, silicone boot, seals, and stainless-steel t-bolt clamps ensure optimum durability and ease of installation. The removable air box lid element allows for easy visual inspection and maintenance of your WCFab filter with an included hydrophobic pre-filter cover, to help keep your MAF sensor, turbo, and engine airways contaminant-free.
Features:
- WCFab Grey Powder Coat Finish
- 4" Intake Pipe
- 144g Aluminum Construction
- Air Box & Lid Constructed Of 10g Aluminum Sheet
- Dry Air Filter
- Outerwear's Pre-Filter Cover
- Includes Installation Hardware
- Silicone Boot & Stainless Steel T-Bolt Clamps
- O-Ring Seal
- Installs Easily With Basic Hand Tools
- No Tuning Required
- Made In USA
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Must wind the time adjustment knob in for it to work!
Its a gorgeous watch and I love the clasp design and band material. It works if you: 1. wind the time adjustment knob with the knob IN/towards the watch 2. pull out the time adjustment knob and wind the side button to change the time or 3. shake it hard- it starts and stays moving easily after that if you are walking/swinging your hand around. I dont know how long each wind/twist lasts but winding it (knob in) will keep it moving even if its just sitting. Options 2 or 3 only keep it moving temporarily. The band and clasp are really smooth and comfortable. The watch itself isnt too thick and the band is extremely easy to adjust to a custom fit (screwdriver and instructions included for adjusting the clasp location). Its really comfortable for an all day wear, is subtle for everyday wear but classy when looked at up close. For under $35 this is a gorgeous, simple watch and significantly cheaper than most of the others I've looked at. Havent tested under water yet though
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Reviewed in the United States on October 8, 2025
★★★★★ 5
Best purchase ever!!!
Color: G9901: Gold band & Gold dial, Color: G9901: Gold band & Gold dial
The best fit,size, quality,weight and value for the individual in my life. You can see all the moving parts in the watch and he loved it!!! Seriously considering getting more for my kids and another color for him.
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Reviewed in the United States on February 20, 2026
★★★★★ 5
.
Color: G9901: Two tone band & Black dial
Very good quality and looks luxury
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Reviewed in the United States on January 3, 2026
★★★★★ 5
Lo bollería a comprar
Color: G9901: Gold band & Black dial
Muy lujoso y elegantes un regalo excelente
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Reviewed in the United States on April 11, 2026
★★★★★ 4
Make sure the clasp is suitable for the environment you will be wearing it in
Color: G9901: Black band & Black dial
I don't know if I didn't look closely at the clasp pick, or if I just didn't see one, but the clasp is a bit weakly designed for everyday wear. It's come unclasped twice in the 2 weeks I've been wearing it
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Reviewed in the United States on May 1, 2026