I'm thinking about adding a midpipe soon when I get new turbos. 2 questions:

1) If I port the wastegate and still keep my main cat for a while, will that affect anything?

2) Where can I get my wastegate ported and how much would it cost?

Thanks in advance.

 

1) No
2) a machine shop, probably around $30-$50

 

Does anyone have a link for a DIY wastegate porting?

 

Its not the porting of the wastegate that needs instructions... just hogg it out but taking the turbo's apart to get to the wastegates is what you need instructions / someone else to do it for you