Hey guys, I am definitely a noob trying to learn the massive amount of information on here but one thing I'm having difficulty understanding is where an xdf file comes from? I have an extra ecu and while my s4 is stage 3, it was somewhat a budget build. My stage 3 tune is second hand. It's for 630cc injectors, Hitachi maf, 4bar FPR (suposedly). what I want to do is read and save the the  stage 3 file cause it runs pretty good, but I want to fine tune for my car instead of the original car it was made for. I'm waiting for a cable ATM but I downloaded the nefmoto flasher and tunerpro. And watched tunerpro basics videos and been reading etc. I want to try and get a hang of tunerpro' s layout. But am stuck here wondering, when I read the current stage 3 tune, will there automatically be an XDF there or will I still have to find one? If i do have to find one, how do i know it's the right XDF I need?

I look forward to hearing from you guys. Thanks for your time.

xdf files happen when mommy and daddy love each other very very much

Thanks for the info. And yeah I've been slowly and surely reading all I can. Unfortunately after an hour or so of reading (anything that is not just this) I seems to always have focus issues. Luckily it's better when its something I'm really interested in, but still sucks when I want to learn stuff.