Appearantly, this information doesn't exist on google
So I've spent countless hours attempting to find the size difference in the h22a7 accord type r header vs the regular h22a header. Went as far as messaging a guy that had one for sale in the UK and this was my reply "42mmx33mm inside diameter on motor side, 45mm outside diameter. Down pipe is 42mm inside and 59mm outside."
I can't find anything confirming this information. Wondering how it compares in size. Also I don't have a spare h22a header to take off to measure to compare. It looks like a downpipe would have to be modified to make everything work. But just looking for some specs.
Also I know I could purchase an aftermarket header but I need for it to remain stock in order to be within the rules for my racing organization