hey guys finally got my JDM H22a S Spec motor in, but only running off the headers :/ loud as balllssss. if i get an h22 downpipe, will it bolt up to my f22 cat? stupid question but no one has answered it as far as google knows.

 

take it to the track and let it scream! i drove mine once with an open header. it was intoxicating.

have you searched to see what the exhaust size/bolt pattern is for the cat? i'm too lazy to do it right now.

 

I have the same setup. 93' prelude s with the f22 and swapped out for the jdm h22a and bought a header for a h22 and it bolted right up.

 

F22 catback is 1.75", H22 is 2". Go to your local exhaust shop and pay the $200 for a 2" cat back. What's the point of an h22 with restricted exhaust? 1 3/4" flows 25% less than 2"

And yes DB, carbon monoxide is intoxicating. Take it to the track and you'll be really loud, still only running 14s, and have a headache

 

no it won't fit. You'll need an h22 downpipe.
Might be easiest if you have the extra cash, and its legal in your state, to just order an ebay no name header. Its basically a stock design made of different material. You may still need an extension made to connect either your cat to the exhaust, or the cat to the header.
I've been running ebay header, ebay test pipe, OEM catback for the last 5 years. Its cheap, it doesn't make the most power, but it bolted together.

Either way, you need to get an h22 downpipe to match the exhaust manifold.

I have come accross the header down pipe for a h23 DC header will bolt to the OEM h22 manifold.... at least with their older design...