Hey all. First off gonna say I'm new to the site and have been reading a lot of post lately. I just picked up a 2006 GMC lbz. I did get it from a dealer and I saw that it has the DSP5 switch. Problem is I don't know what tuning has been done to it. Is there a way to look up the efi live at all or should I have the dealer reflash it back to stock? It does have the egr delete. From the reading I have done it seems like I may have to get all new tuning done. Am I correct on this or has there been a way to see which tunes have been made for each setting?
Thanks for any info!
Thanks for any info!