Quote Originally Posted by Impala131 View Post
It all depends on which "canned" tune you have. The performance shift button just tells the PCM to swap a few tables related to shifting to a set specifically for performance shift. The canned tune could leave both sets of tables stock, it could modify just the performance shift tables and leave the standard ones stock (or vice versa) or could modify both tables to be different. It just depends on who did the tuning. This is a question you should direct to the vendor.
It is a ZZP 1.0. Nothing real special. I will contact Tim and see what he says. I cant remember what he said about it so I figured id ask yall first.

The reason im asking is, if I remove the ZZP pcm to send it back to him for updates. Will it hurt to put my stock one back in while i wait?