Ref: https://honda-tech.com/zerothread?id=491394

Well the stainless manifold and collector flanges are on order.

I'm actually building another version (#5) right now. It needed some more clearance at the cross member plus I think I found a way to build it so that it will work for the 4th gen, 5th gen and vehicles with the ATTS unit. The collector will be located right after the P/S rack shield of the 4th gen, the steering rack of the 5th gen and after the ATTS unit. Then the cat will conect to the header outlet. This adds some length of 2-1/2" tubing prior to the exhaust hitting the volume change at the cat, this will usually help performance.

I was also able to increase the radius of the #1 tube coming off the head (which is always a good thing) and to remove the 2 slight bends in the #2 and #3 primary tubes just before the collector.

 

Sounds good. Thanks for the update!