OK, now this is a little exteme, but it doesn't look like you have much option and it just may work. Failing having a proper mechanic look at it, if it is indeed a leak, check for it by taking all the piping off from the turbos to the inlet manifold, including the intercooler. Put them all back together on the ground. Now you can check a couple of ways.
If you have a pool, get a leaf blower or similar, seal it on one end, seal up the other end, and drop it in the water. Turn on the blower and look for air bubbles. Just like finding a puncture in your bike tube.
Bush f**kanics at it's best!
If no pool, seal a water hose to one end and seal the other end up. Turn on hose and look for water leaking out. You might be able to do this one with everything still on the car by taking off the connection of the pipe you replaced and the connection to the inlet manifold, but it might be a little hard to see where the water is coming from.
Don't forget to dry it out completely before re-installing!
If it's not a leak, but is one of your turbos, then the replacements will have to do, but get them checked first. Also might want to check if your wastegates are stuck open or BOVs are stuck open?