Been doing so much work on this thing, and I take pictures of nearly everything, though I might as well share it. Might be useful to someone. About a month after installing the boost gauge, one day i noticed the car wasn't hitting full boost (12 - 14 psi) it was only hitting 5psi - really consistently. This frustrates the heck out of me because I still haven't figured out why its doing this. The car seems to just randomly go into limp mode, some times its fine, sometimes its not. Luckily it drives just fine even when its in limp mode, just has less balls.
In 4 Picsonly 5 psi... have you checked the connections on the boost gauges inline T? Try also pulling the battery for 10 minutes. during that time try to turn the car on to drain any capacitors. after 10, reconnect and go for a rip. see if that helps.
Resetting the ECU doesnt really fix the issue, sometimes when I pull the terminals it feels great for a while, then it goes back to limp. But sometimes it will randomly go back to normal. Its very strange, but its not my top priority atm.
What gas are you using?Also, depending on the vacuum lines and intake cleanliness, you might want to a) clean the maf and b) think about a catch can (if not already - I just looked at the pictures)
Shell premium, and I'm thinking a catch can is a good idea because of how much oil is coming out from the intake, but now that its clean I'm going to monitor it. And the MAF is clean, the weird part is that its intermittent, why not always limp mode or always good. Also no check engine lights.
Drive it till empty then fill like 1/8 with 94 then when empty fill with 94 and see if it changes.