Yes, I had it altered 4 different times and still wasn't happy. It was either too quiet or it droned. Currently have a Corsa Sport catback, which ended up costing about the same.
People are assuming that the speedometer is off when in reality, we are looking at it from an angle when sitting normally in the drivers seat, so it appears off. If you move your head a little to the right, you'll notice it reads a little differently at highway speeds. Mine was less than .5 mph...
I don't know where you got that torque spec from, but that is WAY too high. I would be surprised if they didn't shear off, over torquing them that much. The proper torque spec should be 106 INCH-pounds followed by a 35 degree turn on each bolt.
2018 heads flow more and the blocks have a little more displacement allowing it to make more power at higher rpm than a gen 2 coyote. There's a reason Bullitt comes with one.
The tuning is a lot more aggressive from the factory on gen 3 coyotes, due, in part, to having 4 knock sensors. As a result, I think that if Ford Performance does offer a power pack for 2018s, it'll only be the setup that's on Bullitt with the gt350 manifold.
Thanks four watching. I'm aware of sport mode (I have used it a lot), but I know for a fact that it has absolutely no effect on throttle mapping for base GT mustangs (based on first hand experience and it can be seen that there is no change in HP Tuners software).
Sport mode only loosens up...