Yeah, pretty sure DPE were bought out by Manta, his were still branded Di Fillipo though. He contacted them directly to buy them though, I can't find them on their site.
He also told me that Castle Headers have a 1.75" to 2" outlet, so if you're really after 1.75" primaries you could get those and have the collectors modified.
The steering column is also a massive problem. There's a heap of headers that have it so one of the tubes is removeable so that the column can go through the middle of the headers.
