Some advice for you!
TD06SL2 10cm $750
Tial 44mm $400
Screamer Pipe $100
Welding gate to rear housing $150
Modifying current dump to suit v-band $150
New Intake pipe $150
Total $1700
That probably about all you will need to spend and they are realistic prices on what you should pay, if you can get the fabrication done cheaper then even better. Considering the Hypergear is $1550 (and you still need a intake pipe, gaskets etc) they would end up coming in around the same price
Also... You can't weld the gate onto the dump as it removes the gases before they hit the turbine, you asking that question really scares me that you have no idea