Originally Posted by esfourteen

As I stated in my previous post, the coolant output of the passenger turbo is routed to the input of the driver side turbo, as you can imagine the coolant coming out of the passenger turbo is going to be hot and is not an ideal source to cool the driver side turbo. this is probably fine for running low boost but the higher you spin the turbos, the hotter they are going to get.

what should be done is the same thing that every factory twin turbo car does, individual coolant source and return lines.