Well... my D4 has 3/4" barbs on it and not 1/2 so no chance with the 3/8" tubing. I use 3/4" from the inlet to a res (about an inch) and 3/4" hose from the outlet to my heatercore as well (3 inches max). I could easily run 3/8" ID tubing from the heatercore to wbs and back to the res though.
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Getting paid like a biker with the best crank...
-MF DOOM
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