Hey guys.
I'm running an Apexi (IHI) turbo kit for my b-series.
I'm not using a heater matrix in the car, so I looped the pipes.

I'm thinking about using them as my water feed and return for my turbo.

Would this be a good source?

Which side would be the feed and which side the return? (The thermostat side or the hose just below the vtec solenoid)

 

There is no feed or return for the water lines, it doesn't matter, as long as it uses one source to go in, and the other to go out to circulate the water within your water system. If you want to use the heater setup, that's fine, or use the water neck and throttle body as water sources.

 

The cleanest and easiest solution is to use the front block plug (they make a fitting with a 6an machined into it) and then weld a fitting to the bottom of the radiator. Short lines and easiest routing