For some there is still a bit of confusion between the Manifolds, Figured i would share. The H22 intake manifold is COMPLETELY different From the F23a1. Larger runners (Two sets), Much Larger ports, Bigger Throttle Body opening, and overal what appears to be a larger plenum area. The top one is the H22. Here you can see the obvious differences in the Port size, and Bolt pattern. Big Difference. Now, according to my Knowledge, The F22B1-2 VTEC manifold Is the EXACT same intake manifold as the F23a1-5 Vtec and Non Vtec. The F22B (Jdm DOHC NON VTEC engine) Has the Exact same manifold as the H23 dohc NON VTEC. (I dont believe they fit Vtec heads, But i am pretty sure they bolt up to the Sohc non-vtec F22x) All F22x SOHC Non-vtec Intake manifolds are interchangable. And The H22 Dohc Vtec, and F20b vtec Aswells as the H23a1 vtec (EuroR engine) all Interchange, I believe the H23a1 has The Best flowing out of the three with the most potential for power? Skunk2 h22 intake manifolds WON'T fit in the Accord engine bay, Sorry guys. Anyone Feel Free to add anything, and if i am wrong please correct me, as i don't want to be giving false information. Hope the pics help!