In 90k miles I cracked the Stucci H pipe and the factory muffler underneath, plus I cracked both of the front pipe welds. There's just too much side-to-side shakin going on!
I ended up with the GT RX H Pipe underneath and that's lasted 40k miles. I doubt those are available any longer, however.
On the front welds I had them fixed at the local shop. Aiken, SC has a lot of good stainless pipe welders due to the Savannah River Site so no problems there. At the suggestion of someone here I also removed the clamp connecting the two front pipe pieces. That was about 35k miles ago and I haven't had a problem since.