I recently purchased scanguage 2 and have installed. Also did some exhaust work at the time. When accelerating under hard throttle I have noticed the scanguage reads up to 22psi boost, then instantly switches to -13 psi. Factory guage continues to read over 20 psi. I don't trust factory guages for much, but I find it difficult to believe that I am going from 22+ PSI to -13 psi in 2 seconds. Any one else ever seen this. There may or may not be a very small exhaust leak on drivers side manifold to up-pipe connection. Cannot see or feel anything when running, and bolts are tight.

 

Re look up your boost coding on the SG2 as I recall others have had this issue with the codeine resulting in false readings.

 

These work for me (at Sea Level in FL):

07E0221440

04685140640

3010

001D0050FF6B