Are you sure those are the ones you have? Those are 67.1mm hub bore and Mustang is 70.3 ... so those shouldn’t even fit over the hub I wouldn’t think.
Why aren’t any of the other tuners doing something like Whipple has with their flight control software? It would be nice to dial back first gear especially and a touch of second.
http://www.justforwheels.com/hub-centric-rings.jsp
I’m not 100% sure if you require them but from the little research I did it looks like you should have them. Stock hub bore is 70.3mm and I believe your wheels are 73.
I’d check to see if the hub centric rings all made it through the tire rotation and or none have been double stacked. Is the 5mm spacer hub centric ?
Jumping in on this as well. I just purchased a 17 gt and had the roush phase 1 installed. Mine runs great except for trying to hold a constant speed in say 4th while barely on the throttle. A/f starts bouncing from 13.5 ish to 14.3ish and you can feel the motor surging/bucking. What issues are...