I was thinking to purchase a second hand stock exhaust manifold and get it ported as i am based in Singapore. So doing this is a lot more cost effective for me.

However i was told there might be a difference between the jdm and the usdm manifolds. Any guys in the US that are driving jdm models can assist me on this?

Thanks in advance!

 

difference is the JDM has plugs for the SAS (secondary air system) or mild factory anti-lag if you want to call it like that. USDM manifolds don't have the holes drilled, however they do have the molded castings so you could ask the place that ports the manifold to drill the hole for you. Just an idea, I'm in the same boat as you (JDM car, far from USA)

 

ahhhh!! does this mean i have to look for a JDM manifold instead... those are pretty rare in USA arent they.