I'm just letting you know the reason why you are going to be searching for a specific downpipe. I had an eBay setup that was going to be going on my car, and decided against it after I bolted it up and found that there was little room for my downpipe, let alone a dumptube for the wastegate. Good luck, you're going to have some fitment issues, man.
Oh, and it's not negative feedback, its criticism. I've done this already.