steveo I have made them before both ca18 and Z18 ect. My workload is pretty full on lately and cant see it quitening down before xmas. Cheapest I would be able to do them for is around $400. ive added a few pictures of the ca18 manifold will fit any GT25-28 turbo as it has nice clearance for compressor ect. You will need to modify the oil pickup and return as well as a dump pipe as I make them central to engien so its easier to make equal length.
I have lots more pictures of them in the making if you want me to email them to you. Shaun I dobt you woudl fit a gt25/40 on a stocker without some modifactions. I may sell mine as iafter december 4th&5th HPC coated ect with dump pipe for $600 .Or $1800 complete with turbo oil & water lines ect ect I plan on making some changes
cheers Andrew