The modifications look nice and the welds look great!
I would like to make it publicly known that the before photos that you took are not of a TPC Racing built exhaust system. It looks like some of our exhaust piping that was cut and modified. I have circled the areas in your photos that show parts of the exhaust that are not from TPC Racing. I am not sure why the system was modified, but wanted to make it known that the way you show the before photos are not of how we build our exhaust systems. We have yet to see an exhaust system give up as you noted and that goes for cars that see over 100k miles with combined track and street use with our turbo system.
We hope that you are still enjoying your system and keep enjoying it!
The circled areas in the photo above show where the system was modified. In order to make these modifications, the exhaust had to be cut. Off of the wastegate, there is a flexible looking pipe. We have never used a flexible pipe on anything before. The photo also shows that the exhaust tips have been cut and modified as well.
The photo above is from 2007 after we installed a turbo kit in house. This shows the exhaust pipes that we have always used, no flex pipes and the exhaust tips are closer together. This is how our exhaust system has always looked and still looks to this day when a system is built here at TPC Racing.