This FSI/TSI K03 turbo flange is used in our VW Mk5/Mk6 2.0T 3" Downpipes. It is CNC waterjet cut from 3/8" thick 1018 cold roll steel or 304 stainless steel. The center hole is machined and tapered to accept 3" piping. Slotted bolt holes allow this flange to fit FSI and TSI turbochargers.
This flange is available for those building a custom downpipe. Gaskets and hardware are available separately.