2008 Evo X. 71,100 miles. Has an AMS TB exhaust, AMS intake with a COBB stage 1 tune. Completed a dry test after driving the car for 20 minutes and then waiting 20 minutes before testing.

Cyl 4-160
Cyl 3-130
Cyl 2-145
Cyl 1-150


Mitsubishi service manual for compression test stated:

158psi standard
92psi minimum
14psi limit

Any thoughts?

 

try a wet test on cyl 3 , see if psi goes up. motor could have some ring damage , maybe it ate a spark plug.