This may sound stupid, but I was wondering what it costs (average) to get a S4 wastgate ported. I need to get this done because I get boost creep bad with my current setup. I will also get bigger secondary injectors + fuel pump in near future.

 

its not that difficult to port it yourself, i just did it a few weeks back, takes only a few minutes and a rotary tool. of course my turbo was already out of the car when i did it.

 

buy a dremel! not the greatest for doing this but that's how i did ittakes a little longer is all. and its a little tricky getting it flush so the flapper sits flush. its recommended to use a die grinder though.

 

I recommend a milling machine.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/serious-s4-wastegate-porting%85-343788/

Scroll down for the pics, I had to repost them.

 

^he's absolutely right^ money well spent for your cars sake!^ safe way of knowing it wont be your fault the wastegate is leaking due to an uneven surface!

 

i used a die grinder for my s5 wastegate came out nice id do it yourself if you trust your work but if you want it done professionally then go for it

 

The hard part is getting the turbo off.
Waste gate porting is easy.
It's all about flow.
No worries about standing wave resonance or tune.

Another trick is filing off the back of the door, so it can open wider.