1. Performance = A big yes. 2 Autotune not necessary with a good map. Ivan's Flash is a good addition but not absolutely necessary and includes maps. 3. Although Yoshi says its not made for use with the stand (the Yoshi has a spot for the stopper to fit?), it works very well with it. Sounds less clunky when the stand hits the stop too. For installation though I recommend fitting the system with the bike on the side stand as the spring for the center stand does rub on the mid pipe when down (Not a problem) but makes fitting hard with the stand down. No hesitation in recommending the Yoshi R77 but if you're a bit slack in maintenance you might want to go full stainless as the carbon can, could burn if you don't repack it when it's needed. They say 5000ml I think but that is probably conservative.
