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USD 349.95
Part #: XD380

XDP Cummins 5.9L/6.7L Coolant Bypass Kit XD380

2007.5-2018 Dodge Ram 6.7L Cummins (Automatic & Manual Transmission) | 2003-2007 Dodge 5.9L Cummins (Manual Transmission Only)
Part #: XD380
★★★★★ ★★★★★ 1 Reviews
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The XDP Cummins 5.9L/6.7L Coolant Bypass Kit XD380 will help keep the engine cool in your automatic or manual 2007.5-2018 Dodge Ram 6.7L Cummins or 2003-2007 Dodge 5.9L Cummins with a manual transmission. On modified engines, coolant temperature and pressure increases often result in a lack of coolant flow. This lack of coolant flow starves the rear cylinders and creates a pressure build-up that blows out freeze plugs on the block, and even the smaller plugs under the valve cover. The XD380 is engineered with a secondary thermostat that is actuated by temperature, not pressure like other kits on the market. 

This Coolant Bypass System is built with a Stant SuperStat Thermostat. The SuperStat features a unique v-notch non-linear design to help reduce cycling by precisely metering the amount of coolant needed to maintain proper temperatures. As a result, you get more efficient temperature control leading to better engine efficiency and longer engine life. With the the thermostat opening due to temperature, this helps to alleviate excessive pressure before it starts by keeping coolant temperatures consistent across all cylinders. 

  • Complete Installation Kit 
  • Includes Stant Secondary Thermostat
  • Ensures Even Coolant Temperatures Across All Cylinders
  • Made In The USA! 

Application Notes:
This Coolant Bypass Kit works on 2003-2007 Dodge 5.9L Cummins equipped with the manual transmission Only.
Although uncommon, some models came factory equipped with a transmission fluid heat exchanger.
If your vehicle has this heat exchanger, you can go to your local Chrysler Dealership and purchase a heater tube (PN:68048997AA) to bypass the heat exchanger and complete the installation.

Warranty Info:
Products manufactured by XDP carry a 1-Year warranty against defects in materials and craftsmanship. The Warranty is Limited to one (1) year from the date of sale and limited solely to the parts contained within the product's kit. Click Here for full warranty policy.

Vehicle Applications

2003 Dodge 5.9L 24V Cummins
2004 Dodge 5.9L 24V Cummins
2004.5 Dodge 5.9L 24V Cummins
2005 Dodge 5.9L 24V Cummins
2006 Dodge 5.9L 24V Cummins
2007 Dodge 5.9L 24V Cummins
2007.5 Dodge 6.7L 24V Cummins
2008 Dodge 6.7L 24V Cummins
2009 Dodge 6.7L 24V Cummins
2010 Ram 6.7L 24V Cummins
2011 Ram 6.7L 24V Cummins
2012 Ram 6.7L 24V Cummins
2013 Ram 6.7L 24V Cummins
2014 Ram 6.7L 24V Cummins
2015 Ram 6.7L 24V Cummins
2016 Ram 6.7L 24V Cummins
2017 Ram 6.7L 24V Cummins
2018 Ram 6.7L 24V Cummins


  • MFG. Number XD380
  • Manufacturer Name XDP
  • Shipping Weight 15.00 lb.
  • Shipping Length 12 in.
  • Shipping Width 9 in.
  • Shipping Height 4 in.
  • Fuel Type Diesel
  • Warranty Yes
  • Warranty Info 1 Year / Unlimited Mileage
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
5.0/5 Stars out of 1 Reviews
6.7 cummins coolant bypass
(Longmont) | May 14th, 2021
10 - 15 degrees cooler great product.

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