I'm thinking about buying a sct flasher because I am getting 4.10 gears and want to advance my timing but dont feel like getting a timing adjuster and that. Right now i have very few mods on my car just a k&n filter and bassani cat back. I will be getting the tuner now but over the summer plan on getting an x-pipe, adding a maf, pullies, plemum, throttle bodie, and maybe a couple of other things. Would i have to get a new tune put programed into my flasher? Would the tune be different for those mods? Could i get a new program burnt onto the flasher if so how much and would i have to send it all the way back or could i get it through an email or something? Finally what are the average gains from the tuner?