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Message: [QUOTE="Stroked777, post: 1075256, member: 10884"] nope they email you the tunes, matt at gearhead is awesome, I sent him a tune one day to have it revised at 9 pm and had it in my inbox by 11pm only difference between the programers is that the h&s allows shift on the fly tuning, so you can change horse power levels without having to go through the tuning process all over, it still keeps the same trans file, all it does when you change power levels is change injector pulse width, ipw is how long the injector opens, the longer its open the more fuel that's put in and more power you make up until you run out of air to support the amount of fuel being injected. this is probably more involved than you though lol [/QUOTE]

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