I have a 2004 civic with the crap d17a2. I have been reading about the d16y8 intake swap and in my junkyard hunt i found a d15b7 intake. From the looks of it, its the same as the y8 intake. Besides the slightly smaller plenum, can this intake be used on my a2 head and would it flow better the the stock intake?
When the engine put a rod through the block I thought what better time to make my daily driver have a bit More power. I know it's not going to be Alot, but here is my build idea. All input would be greatly appreciated. Thanks.

Build idea
D17a1 block
D17a2 head p&p with stage 1 cam
D15b7 intake with cold air or the y8
Header with full exhaust
7lb flywheel with stage 2 clutch

 

Even with some way to tune that setup, you'd still only be looking at 10-15whp... which would hardly be noticeable.

 

Would u have to have something to tune it for it to run right

 

Most certainly. Otherwise you'll see no gains.

 

So the car would run fine but would run as if it was a completely stock engine

 

Probably not. Because you'll be changing how air/fuel is delivered, both in the change of flow, as well as cam timing... you're probably going to notice a decline in performance until its tuned properly.

 

you want to put the manifold from a 102 horsepower engine onto a 127 horsepower engine.

this is a terrible idea imo.

 

I can assure you the manifold has little to nothing to do with those performance figures. The engine displacement, and improved fuel atomization are mainly the cause. One of the major weak points of a D17, when considering running a turbo, is definitely its plastic intake manifold. The cast aluminum manifold from older generations would actually be an improvement.

 

This why i asked dont want to spend time and money for no hp gains i think im just going to put a stock motor back in it thanks for your input

 

I can assure that you are wrong. The d15b7 manifold is the second smallest d series mpfi manifold. It has tiny ports and tiny plenum. If he was doing a y8 or z6 manifold i would not say anything. Seeing as i have used an a6, y8 and edelbrock manifold on my engines and a complete b7 engine i am very confident of my answer based on not only experience but solid understanding of the science behind the manifolds. Going from the plastic junk manifold to a cx, vx, hf, d15b7 or d16a6 manifold is a big step backwards.

Skunk2, edelbrock, z6 or y8 will be an improvement. Just because the b7 manifold has a plenum and four runners doesn't make it as good as the y8.

 

I think you seem to misunderstand my post. I was simply stating that you really wouldn't see much of a change from the stock manifold, in a non-boosted application. I never once compared the b7 to the y8 or other alternatives.