Never seen that kit and it's well hidden. One concern I would have is that it's so far down the exhaust that the turbo lag could be huge as compared to being very close the the start of the exhaust.
an issue with turbos is waiting for the turbo to spin up. That looks like a lot of exhaust to compress to get the turbo up to speed.
Not to mention a hot as heck turbo near the seating area instead of being out in the air.
Keeping the turbo and intake charge cool under there is going to be tough.
One other issue with most bikes is the compression. You need low compression to do more boost.
Overall, it seems like the kit doesn't address any real issues with a conversion: Lag, Heat, Compression, etc...
Heat and high compression can kill the whole reason to convert.