SPE Motorsport 6.7L Powerstroke Primary Coolant Tank with Integrated Battery BoxSPE Motorsport 6. 7L Powerstroke Primary Coolant Tank with Integrated Battery Box The factory plastic coolant tank on the 6. 7 Powerstroke is known to discolor, crack, and weaken under heat and pressure. Add performance parts, higher coolant temps, or tight compound turbo packaging, and the stock tank becomes a failure point. The SPE Primary Coolant Tank with Integrated Battery Box eliminates those issues with a fully TIG welded aluminum assembly that