I'm not very familiar with where exactly the stock wastegate is located, or how it works. However my question is, is there any external wastegates that can be added to the stock turbo setup, my thinking is that it would be easier than having the stock one ported and then still possibly having boost kreep problems with an open exhaust.
thnx fo rany input

 

Here, this thread is about 15 underneath yours.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/pics-my-external-wastegate-stock-s4-turbo-tial-38mm-d-567832/

There are none you can just "purchase" you need to piece together what you need for piping, wastegate and hardware then build it yourself...orrrr pay someone else

remember, searching is your friend