05 sti _ LOW boost *solved

Kuiqshifta

New member
Ive bought my 05 sti a little over a year ago with 79k doing a bunch of maintances left unattended to by last owner. One of those a new turbo due to bad seals. (I put bandaid on CEL ineficient cat code to make it disappear using 02 extender.) Recently after turbo swap ive noticed horrible 7psi - 10psi boost. After checking all vaccume lines with minor leaks,... problem still exists.

The root of my problems?.... A clogged cat on downpipe! I had changed out the uppipe as well due to me torque'n on 02 sensor and cracking original pipe. I picked up a CNT catted downpipe from ebay and now i plan on limping it untill i get a tune this week or the next.

Im new to the forums and wanted to share this 1 out of 100 parts that can cause your low psi readings.

 
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