I'm going to some auto part shop to buy vaccum hoses for my intake swap, is there a reference somewhere for the size of each hose on a 2001 b18c1? I've already searched and didnt find the infos, hence this thread. Thanks

 

I once heard that you can measure the barbs to figure out the sizes yourself. It's a novel idea, try it.

 

nvm, i already found the answer :
https://honda-tech.com/forums/acura-integra-6/skunk-2-gsr-intake-manifold-official-thread-682550/

3/8 and 5/16!