An otherwise stock XR2 will try to boost to 15psi if you rip the exhaust off. Not recommended. Wastegate hole is too small and it throws it all into the turbine.
When I swapped to the Tbird hybrid, I ran an open downpipe for a day or two till i was able to weld one up, I didnt have issues though cause the VJ11 port is larger and I had ported the living hell out of it to avoid creep issues