Hey there, I see you've found my garage. Below you will find a list of all of my tunes. These definitely won't be the fastest tunes available(I'm a bad driver with low patience), but they should be faster than if the settings were left stock. All of the tunes and paint jobs can be found by searching for Sin Motorsports Garage within Forza 6.
Formula E
Tuned for the Career Volume 4, Formula E Series
Currently, this tune is just for the #2 Virgin model, but if there is demand for it, I can copy the tune to the other models.
Hot Wheels Bone Shaker '11 "Widowmaker" Pretty much just a drag tune, if the settings and tires didn't give that away. You can try it on actual tracks but... it is called the Widowmaker, so you can guess how that will end.
Ford Mustang GT '15
This one isn't actually a tune. I created this paint job for the current Forza Racing Championship Season 1 events, which don't allow any custom parts. I added +0.5 psi to each wheel, but that didn't feel like enough for me to post a whole tune. As always, you can find the paint job within Forza 6 by searching for Sin Motorsports Garage.
Formula Ford EcoBoost 200
Tuned for the Forza Racing Championship S1W2. There are two different paint jobs; Black/White is listed as SMG EcoBoost, White/Green is SMG EcoBoost Alt. The tune is the same for both.