2x 16mm coolant plugs required when replacing the stock VGT turbo on your 6.7L Cummins with a non-water cooled turbo like s300 or s400. They will block the coolant ports in the stock feed on the riser block and return on the firewall.
Diesel Auto Power
VGT Coolant Line Plug for 6.7L turbo conversion (2 required).
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