OK, I have been looking around on here for a while, so im basicly just looking for ideas on what order i need to do mods and what would be best. I have a 2006 gt. stock other than cai. yes no power there but sc sounds better. Planned mods 1) PCM from 3800. 2)Speed Daddy headers.3) 180 tstat.4) Smaller sc pully. So my questions are can i get PCM first and will that make gas gauge read backwards like ive read about the 05s? What size pully is safe, will I need cooler plugs? And should i do entire exhuast or will headers be ok for now. Hafta spread some of this out, not what ya call rich here. Thanks for the help, alot of knowledgable people on here, love the forum!