how easy is it to weld bits onto a cast exhaust manifold??
ie: welding bits of pipe onto it with a good seal/join ??
in the past ive heared that welding to cast material is a no-go zone, but thought it were worth asking specifically about exhaust mani's...
i mean, people build entire extractors using an old exhaust manifold flange dont they, so it must be possible to do... or dont the welds last or something???