The rules are still not out yet, but is limited to a 2.5 intake. This was to try and keep cost down and the Duramax has a 2.5" turbo and allows the other brands to equal the Duramax turbo. This turbo will be going on my 96 Dodge 12 valve. Do I start with a 2.6 turbo and get it bushed down? I have heard to use an S400 or a GT42 and use tight housings on them. Any ideas?