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- USA
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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
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For Your Every Summer RSVP, with Code: SUMMER15
Description
INDUSTRIAL INJECTION 436403 CP4 TO CP3 CONVERSION KIT WITH PUMP2011 2016 GM 6. 6L DURAMAX LML (CUSTOM TUNING REQUIRED) The Industrial Injection 436403 CP4 To CP3 Conversion Kit With Pump is a sure way to increase reliability and performance in the fuel system of your 2011 2016 GM 6. 6L Duramax LML. Built as a replacement for your factory CP4, the CP3 Conversion Kit eliminates the CP4 and uses the more reliable CP3 Pump. Proven reliability! The factory installed CP4 has known failure issues that cannot be
2011-2016 GM 6.6L DURAMAX LML (CUSTOM TUNING REQUIRED)
The Industrial Injection 436403 CP4 To CP3 Conversion Kit With Pump is a sure way to increase reliability and performance in the fuel system of your 2011-2016 GM 6.6L Duramax LML. Built as a replacement for your factory CP4, the CP3 Conversion Kit eliminates the CP4 and uses the more reliable CP3 Pump.
Proven reliability! The factory installed CP4 has known failure issues that cannot be remedied. When these issues occur, they can cause damage to major components of your fuel system. The CP3 fuel pump has been proven to provide longevity and reliable performance. This kit includes a stock CP3 pump which is capable of 500+ HP!
FEATURES:
Increased Reliability Capable Of 500+ HP!
CP4 To CP3 Conversion
Not For Stock Applications - Custom Tuning Required
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
4.6 ★★★★★
Based on 2330 reviews
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Product Reviews
★★★★★ 5
Great shirt
Size: XX-Large, Color: Blue
This ships fit great and is a nice material. It's now my favorite but two other colors of the same brand and size were not the same material
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Reviewed in the United States on May 11, 2026
★★★★★ 5
True oxford, comfortable, good fit, iron
Size: Large, Color: Light Grey
Great clean-cut, casual shirt. Material is thick as you should expect for a true oxford shirt, even with the stretch/elastane. Good fit, sleeves arent overly long. You’ll probably need to iron it. Overall very happy with purchase.
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Reviewed in the United States on March 27, 2026
★★★★★ 5
Amazon Essentials competes well with other store brands
Very Nice and comfortable shirt, on the thicker side and is slightly blue, baby blue perfect in fall winter might be a little thick for summer. the buttons and stitching all seem well done for the price. The size was true and fit great, the big tall size worked great, the shirt does not seem to wrinkle easily since it is thicker
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Reviewed in the United States on November 25, 2025
★★★★★ 4
Really great shirt, really thick material
An unexpected pleasant surprise. Really nice quality, minimal shrinkage, and very few wrinkles out of the dryer. Nice, comfortable fit, and for big-but-not-tall guys, the fitment is very presentable. Sleeves aren't crazy long, and the shirt itself isn't so long that you feel like you're wearing a dress.
These aren't complaints, but I do want to share two notes that were important to me:
1. If you want a breast pocket, be sure to select the right shirt. There are two different versions, and it's not particularly obvious which is which.
2. The material is thick. Really thick. So the shirt is pretty heavy, and it doesn't breathe very well. For me, this is unquestionably a winter shirt. If, like me, you tend to run a bit warm, this shirt can make you feel like you're wearing a parka.
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Reviewed in the United States on October 6, 2023
★★★★★ 5
Great Value from Amazon Essentials
I can’t believe the quality of this shirt given the low price I paid for it. It fits perfectly, looks impressive, and is very comfortable. The shirt has survived two washes so far and looks as good as new. I couldn’t be more satisfied with this purchase.
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Reviewed in the United States on December 11, 2025
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