Wastegate plumbed. I TIG'd the merge into the downpipe, then TIG'd the elbow to the Wastegate flange, then cut a wee disc of 2.25" to fill the gap, welding it all in place so that (theoretically) nothing warps or moves during the weld. I've let it cool completely in place, and will see how bad it is later.
Working on the rest of the downpipe, intending to take it to a band clamp by the trans.