I'm preparing my turbo setup in my LS/VTEC and I'm going to design turbo header for my application. I wonder if someone could direct to source I can get some graph or diameters of exhaust header gasket for B16A so I could prepare flange for new header.

The second thing I'm looking for is some source to buy flanges for T28R turbo (the same as is installed in Nissan) to prepare downpipe and for new header connection with turbine.

Thanks in advance for any help.

Wojtek