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Description
H&S Motorsports Dual High Pressure Fuel Kit with CP3 11-16 6.6L DuramaxThe potential of the LML Duramax to deliver unreal power has been proven. Simple programming and exhaust modifications have pushed these engines well past the 500 RWHP mark with ease. And as diesel enthusiasts typically do, the limits are being pushed to see what kind of power can be pulled from these trucks. One of the limitations found is the factory CP4 injection pump. While this has shown (so far) to be a reliable pump, it's also shown to be
The potential of the LML Duramax to deliver unreal power has been proven. Simple programming and exhaust modifications have pushed these engines well past the 500 RWHP mark with ease. And as diesel enthusiasts typically do, the limits are being pushed to see what kind of power can be pulled from these trucks. One of the limitations found is the factory CP4 injection pump. While this has shown (so far) to be a reliable pump, it's also shown to be essentially a bottleneck. When trucks are pushed above the 500 horsepower mark, the additional power gains begin to diminish due largely in part to the lack of rail pressure. Because of this, HS Motorsports has developed a dual pump system to cure this issue, and deliver enough fueling to support 900+ horsepower!Just as a quick reference for you diesel nuts out there, the engineers at HS Performance were able to run 3800us (not recommended) of main injection duration on stock injectors without a drop in rail pressure. So what does that mean? Well, think about it this way; their off-the-shelf HOT tune commands around 1400us and is on the verge of draining the rail on a stock CP4-equipped truck. At 3800us, that is a 270% increase in fuel demand from their HOT tune and limit of the stock CP4. The HS Motorsports Dual High Pressure Fuel Kit was able to maintain the commanded 29,000 PSI rail pressure without skipping a beat.
One of the HUGE benefits to this system is that it includes a BRAND NEW CP3 from Bosch. That's right, BRAND NEW, not a remanufactured unit like many other companies utilize. The key to ensuring the longevity of any high pressure fuel pump is by providing the high pressure fuel system with clean, waterless diesel fuel. Any fuel contamination that reaches the high pressure fuel system can be detrimental to reliability and performance. Because of this, we highly recommend using a FASS, AirDog or similar lift pump for proper filtration and water-separation.
Why does HS use a CP3 in instead of a CP4?
There are a few reasons they chose the CP3 over the CP4:
- The CP3 pump has been proven to be reliable. This pump technology has been used on the Cummins and Duramax platform for years.
- While the CP4 has the capability of delivering higher pressures, it lacks the volume of the CP3. With both pumps installed, you get the best of both worlds - high pressure and high volume.
- Price. With the CP4 being a newer pump, it is obviously more expensive. By saving on the pumps included with the kit, we can pass that savings directly on to the customer.
- If your fueling demands exceed what the stock CP3 and CP4 are capable of providing, one of HS' 6.7L Cummins 10MM Stroker pumps can easily be used as a replacement while still being able to re-use all fittings and lines included with the kit.
- This product will NOT work with trucks that have dual alternators. The HS Motorsports CP3 pump is mounted where a dual alternator would be located.
- This product may not work with the EGR cooler installed. It may need to be removed.
- This product MUST be used in conjunction with custom tuning calibration. Failure to install the correct calibrations can result in engine damage.
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
4.7 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 4
Good quality and soft, but not for everybody.
Color: White, Size: Queen, Color: White, Size: Queen
These pillows are super comfortable if you like thick, firm ones. I absolutely loved them, they feel high-quality and supportive, but they are very thick, and after a while, I started getting some neck pain.
That said, over time they do soften up a bit and start to mold better to your body, which helps. I’d definitely recommend them for anyone who likes big, firm pillows, but they’re probably not the best choice for people who prefer something softer or lower.
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Reviewed in the United States on October 15, 2025
★★★★★ 5
Soft & support
Color: White, Size: Queen
These pillows are perfect! I was looking for a cushy, lower profile pillow for side sleeping. So soft, supportive and comfortable! I could not believe the high quality at such an affordable price! They are queen size, so I need to purchase new longer pillow cases.
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Reviewed in the United States on March 16, 2026
★★★★★ 5
viewstar - Juego de 2 almohadas
Color: White, Size: Queen, Color: White, Size: Queen
Muy buenas y cómodas solo la tengo hace 2 días ojalá no se desinflan como otras que yo he comprado , pero si son comodisimas si en un mes se mantienen igual pienso comprar 2 mas
They are very good and comfortable. I’ve only had them for two days—I really hope they don't go flat like others I've bought—but they truly are extremely comfortable. If they stay just like this after a month, I plan to buy two more.
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Reviewed in the United States on May 17, 2026
★★★★★ 3
Odd, but nice pillows...
Color: White, Size: Queen
These pillows are nice, but strange for me. ..I purchased 2 in queen-size. They are slightly longer than I prefer but doable..and have an odd soft yet firm texture. When you lay the head down ..it sinks into the pillow, but each side comes up. So you have these big sort of firm soft, fluffy pillow ends on each side of your face. If you're a side sleeper, you will automatically try to punch one of the ends down a bit, for the most part, that will be useless. So you will probably end up trying to angle it a bit so that you end up sort of sleeping on the corner sections. (This was for the queen size, for me. The standard may be better.) Also, there really no cool side. If you flip it..it might feel cool for about 2 seconds, but that's it. They are very nice pillows, but I just know I will be ordering something else in the future.
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Comfy, soft, helps me sleep without pain.
Color: White, Size: Queen
These pillows are very comfy. Lately, I'd been waking up with pinched nerves in my neck and shoulders so I decided to try new pillows. I've been using these pillows for a couple of days now and I no longer have any pinched nerves. They're so comfortable to rest my head on. If I had to make one constructive criticism, its that I wish they were thicker. I know its just personal preference but I like my head to be elevated more.. however, using 2 of these pillows does the trick! Also, they come packaged really well... vacuum sealed and in a box (which is good because they sat out in the rain for 7 hours).. and they didnt have a strange odor to them. For the price, they are great.
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Reviewed in the United States on April 17, 2026