I am trying to find out if the lower half of the 4-2-1 design OEM exhaust manfold from any Honda/Acura will fit my application. I understand it will not bolt right on and custom modification will be necessary.

I am looking to see if anyone who has one of these manifold (D, B, H, F-series) can take a quick measurement and let me know if there is a site or thread that might have this info.

Here is a pic of my manifold I am trying to match