I am going to have say something here..............I have a V6 ATX Mytique w/ that silly OD button. I keep hearing that all it does is deactivate the Overdrive.
After having driving my misty quite aggressively over the last 2 years, I have concluded that statement is WRONG.

I have noticed shift point changes between 2nd and 3rd of at least 500 rpm, especially in the higher rpm range (>2000). This is not some vague impression, this is a continuously validated observation. I have also noticed that shift point change decreases in the low rpm range. I have also noticed similar behavior when shifting from 1st to 2nd.

Those are my findings.

Regards,

Fastfolch
'98 Mysty
kkm
FMS wires
Bosch +4's
2.25 inch custom exhaust
15x7 wheels