ok i have a garrett t57 '''like the same thing as a t3/t4 with an internal wastegate with an 11 pound spring in it. where do i find an actuater arm or the whole wastegate itself with a 5-7 pound spring...i dont want to do external wastegate right yet.

 

try searching for 'wastegates' on ebay. There are adjustable ones on there all the time

Mike