@Ariel ******
if you apply for an extension for whatever reason, it would be denied because you don't meet the requirement, then they give you 7days to leave the country.
It is the same extension fee of 1900thb, 2days overstay fine is 1000thb.
If you are caught (for example, at some checkpoint before you arrive at International airport) on overstaying even 1 day, you will be arrested, sent to iDC(Immigration Detention Center), and blacklisted for 5 years.
The decision is yours.