I just got the invidia cat back system but can't install it as my car doesn't have a cat on it (not real sure) It is an hf which has been swapped to a b16 there is just the exhaust pipe connected to the headers. I am not real sure as I had a shop do the swap for me. The engine has the stock jdm xsi header on it(not sure of size), so my question is what size cat should I buy since exhaust is 2.36in. Should I buy 2.5in or 2.25in? Thanks in advance.

 

why not just have that shop install a pipe from your header to your new exhaust system??? should be cheaper.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jacoop86 &raquo;</TD></TR><TR><TD CLASS="quote">why not just have that shop install a pipe from your header to your new exhaust system??? should be cheaper.</TD></TR></TABLE>

I got mine for like $170 with the CAT wilded on.

 

I'd rather just have the cat instead of just a test pipe.

 

cat who needs a cat? i just ran a 3" pipe all the way from my header back. to keep it leagal i just welded the shield onto the pipe. but i live in a non emissions county

 

That's why I wanted to keep the cat because I have to do the emissions tests and figured thats the only way I will pass.

 

bump. anybody have a suggestion what size cat I should buy?

 

your cat should be hanging directly off your exhaust manifold.. if im not mistaken. you may need a new exhaust manifold if you want to run cat-less, and also if you want to run an aftermarket cat.

the issue is that honda moved the cat very close to the exhaust ports on the hf so to retain more heat so it lights off quicker. so instead of having it under the firewall like in the dx and si models, they made a different manifold that holds the cat right where you would want a turbo to go. you might want to hang on to that manifold if you ever want to go turbo in a d series, cause it is a simple $20 adapter plate to hang a couple different turbos from. and you can resell it too.

 

since your car WAS an HF it had the cat in a funky spot, hanging right off the exhaust mani(hence the reason hf manifolds are used as diy turbo manis)
what your shop probly did was put a header on an connected a pipe were the cat should have been to your stock exhaust. what you need to do is find someone with a civic or integra cat the they arnt using and have it all fit up together or go to checker or napa and get a universal weld in cat and then weld it in to your new exhast

easiest thing would be to go on ebay buy an ss aut chrome header and find a friend with a cat you could have


*edit*^damn you beat me too it**

 

where are you from in colorado ef8ight?

 

south denver