Your EXUP is the butterfly / valve that is in-line between your center muffler/Cat and the stock exhaust can. It is controlled by cables from a servo motor under the tail / behind the rear shock.
The EXUP errors (17 and 18) are because:
1. you removed your EXUP servo and/or valve when you installed your exhaust.
2. your EXUP valve is stuck / cables are seized up
3. your wiring harness is disconnected from the servo motor.
If any of those circuits are defective, the engine trouble warning light will come on, and then the multi-function display will indicate a two-digit error code (e.g., 11, 12, 13).
If the multi-function display indicates such an error code, note the code number, and then have a Yamaha dealer check the motorcycle.
As all those require a specialized testing tool I would recommend you to take it to a dealer unless you know what you're looking for.
Good luck and don't 4get to rate the advise. Cheers
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