explosive

I'm looking to buy an Imagine Engineering header within the next couple of weeks and I was wondering if it will fit a del Sol with the H22 swap. I know that it has the same chassis as the Civic, but I just want to make sure before I order it.

Also, right now, I am running a JDM H22 header, then it connects to a downpipe, which is welded into 2.5" piping all the way back to a Skunk2 universal muffler. The question I have is whether getting this header will allow me to ditch the downpipe and just weld the header's collector straight to the exhaust piping, or does it not extend that far? The reason I am asking is because I don't know if I will need a flange or not and if I don't need one, I don't really want to get one and have just waste my money like that.

Any help would be appreciated, thanks.