I was just doing some research on N2O and i was looking at the ZEX system, it says your engine must have a vacuum ported fule pressure regulator, and i was wondering if my 93' Civic HB DX engine has a vacuum ported fule pressure regulator???

Also I wanted to know if anyone has some websites for engine parts and whole engines at good prices???

get back to me

PEACE OUT!

yes your DX has a vaccum port on top of the regulator...as for the websites, do a search

If you pull the little hose off of your fuel pressure regulator you will notice that it sucks like a vacume and you will notice your rpm's go a little higher when you pull that little hose.