As has been noted here previously, aftermarket eBay header fitment can be hit or miss. Some seem to fit and align perfectly, while others are off enough so as to be practically unusable. And there is no good way to predict this beforehand - you just have to roll the dice and hope that you get lucky.
Assuming that you currently are running the Euro non-cat manifolds, my personal opinion is that for most practical street-driven purposes, there is not going to be a huge performance gain to be had via the use of headers. Accordingly, if I were in your shoes, I would choose to keep things simple and would retain the OEM manifolds.
You would then end up with a system such as I posted on Page 1, Post 19 in this thread, reposted below:
And here's the finished view:
Threaded Mode
