I have a 2000 Civic Si and Im doing a USDM ITR swap and I need a thermostat housing and hardpipe for the swap. Does anyone know for sure if my 99-00 Si thermostat housing and hardpipe will work? I know the ITR has three lines and I believe my Si only has one. Any help would be helpful. I tried to search already.

 

There are at least two different ones. I have two B series engines, a 1994 and 1996 GSR blocks and they have different water pipes, thermostat housings and covers. I think they're interchangeable though.

 

my 2000 si had a different one than the JDM motor i swapped in. there were more holes on the JDM version. i just pulled the one off my stock motor and put it on the new one.

 

I wasnt sure if the hardpipe on the B16 was shorter or anything like that. Like I said, I know the ITR has three lines and I just looked and my Si only has one for sure now.

 

Bump