Hi guys wondering if anyone encountered the same issue or know of the cause. I recently acquired this 2006 GD with L13A 5MT. when I drive all gears won't go beyond 5k RPM. is there a sensor or switch somewhere that triggers the soft limit? it is drive by cable by the way and speed sensor is erratic and sometimes pops up CEL with speed sensor errors ( even with brand new working speed sensor installed )
Looking for insights as I am planning to play autocross by the end of the month but can't seem to find the problem.

Thank you!!