I have been searching off and on for a few months for an answer but I might not be putting in the right search criteria due to my heavily limited knowledge on the subject so here I am.
I recently have gone through the process of updating my 05 WRX USDM to stage 2 (full non-catted exhaust, Cobb SF intake, TS BPV and just ordered a new Y-pipe kit. Tuned via the XPT stg2 map ). In the tuning instructions, I was told to adjust my WG actuator arm to attain 16.8psi boost. I have the TD04 IHI turbo which is non adjustable. I've read a lot of good write ups and such but only found one that barely mentioned the IHI being non-adjustable. So, I've been looking for new WG actuator arms and have found a couple but have no idea if they will work for my application.
Turbo Internal Wastegate Actuator Subaru Impreza WRX TD04L 13T 1 2 Bar | eBay
I've found cheap td04L turbos on ebay so do I have to go that route? Seems kinda like a waste to not be able to adjust the PSI on a turbo. Read up that it's not a good idea to against tune recommendations like using a mbc(I really don't want to get another tune).
This has plagued me for quite a while and any help would be greatly appreciated. This might be kind of a dummy question but I want to be thorough.