I like my TXS and you can also switch between catted/catless easily with the race pipe section. No leaks with mine. I just use a normal 3" Grimmspeed exhaust gasket at the break between sections (then a GS to OEM Mid adapter and donut gasket).
If Grimmspeed does release their new DP for us like they did the earlier WRX/STi guys, I'll have a TXS up for sale