It is just the ebay manifold for the is300. I welded on some extra braces and cleaned up the flack on the inside of the collector. The build is mostly "budget" oriented, I am buying a lot of stuff either used or just making something work. I actually got the turbo off of a giant Cummins tractor engine with 2 hours on it, lol. All I can say is take the info on other threads and other builds and use it, but don't think that its the bible. This is just my build and posting pics and updates motivates me to get it finished, let me know when you get started!