I'm referring to the same. So you loosen the slip joints, unhook the exhaust from the hangers. Then put the bottom of the down pipe studs or bolts through #11 with the exhaust gaskets. Put the copper nuts on hand tight. Now go to the turbo area and push the down pipe against the turbo with a new gasket in there too. Try to get a vband on it to hold it while you twist and push a bit. Once it's on the turbo side, then go under the car and tighten the rest of the exhaust and bottom of the downpipes up. It doesn't click together like LEGOs, but it should not be touching your trans or firewall once tightened down.
Here is the thread where I got some help. Might help you as well. Has the gaskets needed etc.
https://www.xbimmers.com/forums/show....php?t=1537226