hey whats up honda-tech I have a 99 civic 4dr lx and im wanting to swap over the ex manifold onto it, whats the best way to do it and what all is needed? I have the manifold, throttle body and throttle cable also the stock intake bos and all from an ex is with it any pics or anthing on how to do it? please let me know very interested. Thanks!


Also like a diagram on what hoses go where on the new ex manifold if any?

 

i dont think there is any performance gain on just swap the d series oem intake manifold. why waste your time?

 

cause I have the parts t do it and ive heard from a buddy of mine it made a differance from the crappy lx dx manifold it made a differance, either way its something for me to learn on lol..

 

well it HAS been proven (in an article of hondatuning i think) that the d16y8 intake manifold does make a very small amount of horsepower over any other d16 manifold....why dont you just swap over the whole head?

 

the y8 manifold is a pretty good upgrade from the y7 top mount throttle body manifold , which has a very small plenum. swap is pretty easy. but depends on which y8 mani you got. is auto or 5spd, and is it 96-98 or 99-00?

 

yea I got the one from a auto vtec but it looks like i can just swap everything over I got all the differant hoses and lines and what not to make sure..

 

if you got the whole swap, including throttle body, then its pretty easy. but if you got a 99-00 manifold, then it has the ir asist holes by the injectors. block those off.

 

should of got the y8 head also. And the y8 manifold does produce the most flow compared to all the other d series manifolds.

 

are you talking about the two holes lined up top to bottom? I heard i have to block off the coolent lines to the manifold? I appriciate everyones help also the little black box on the back of the motor what does that conect to?

 

sorry, i meant "air assist holes" or something, they are next to the injectors, and have a rubber hose going to them.