Bo94Accord

Here pretty soon I'm going to be putting a header on my civic just as soon as I decided which brand to purchase even though there pretty much all the same as far as material of the tubing is concerned. I will not be putting a cat on seeing that the cat is part of the oem manifold and is really not a big ideal seeing I didn't run a cat when I did my headers and exhaust system on my Accord. I have been reading up on them though and in a Honda forum elsewhere it was saying that I would have to do some modification if I was to put a header on without a cat. I know that any header for a 1.6 Honda will work even if it says for Ex or Si but I just want to make sure I'm not going to have any issues when I do get the header and start to bolt it on. Any help would be greatly appreciated.

Thanks
Bo