Here's a little tip that worked for me...
After going through passenger side donut and pipe in less than 50k, I was looking at the parts and realizing that the amount of "crush" that goes onto the donut is limited by the point at which the flange seats against the turbo inlet housing (baby's butt part). So before installing the new pipe and donut, I ground about 1/8" off the face of the flange that pulls up against the inlet housing. I Got Crush now Baby! I also used accousti-seal exhaust assembly sealer all over the donut. I think it is a Walker product that is also available under the NAPA label.
Good luck and God bless,
TC