exhaust manifolds welded up

exhaust manifolds were TIG welded up earlier this week, and I'm glad to report they fit the cylinder heads perfectly.

couple of pictures:

View of the collector internals. BMW have done a great job to ensure the primaries meet smoothly and eliminate turbulence. In their case this was to ensure an even distribution of flow into the catalyst for emissions optimisation, but for me it is great to maximise high-rpm power.

The manifolds will eventually get a ceramic coating once the remainder of the exhaust system is complete and welded.