It must be normal in Japan to see the older generation bombing around in neon lambo's instead of sitting at home with tea n crumpets...why is the UK just so boring lol it's all going down in Jap land!
You won't see power but your rev's should increase, lose some torque aswell, I have a stock flywheel hanging around if you know a handy workshop you could have it lightened and rebalanced.
I would trust a weld over a bracket any day of the week, give it a few years and I reckon not many people will be running internal wastegates, these turbo's will still hold the value all day long