Still working on my h22 swap. The motor came with the ex. manifold but not downpipe and my OEM h23 downpipe doesnt match up. I've looked on the classifieds here on honda-tech, craigslist and ebay.
Also, If i were to get a downpipe for the h22, would it fit up to the stock cat. ??

 

i did the same thing you are doing. go to autozone or advanced and you should be able to pick one up for around 200 bucks. and yes the downpipe goes right up to the cat no problem