well i want to change the dhp pcm back to my stock one for the winter but does it affect if i have the switch if i turn it on or off the switch is for the perfomance shift since mine dont come with that nomore its a 2001 gtp . Try to call zzp to ask that nobody answer so iam asking u guy's. Iam trying to get ready for the winter . so i have a couple of things done already like change the motor oil ,pcv valve , gas filter, and thermostat , so try to get this done heir so if u could help that be great :lolsign: