It's funny, I've seen many comments around the web related to this kit where people seem to think a super charger is on all the time....
Yes, it is spinning all the time,,, but it is not typically making boost. Most of the time you are in bypass/blow off mode. You only get boost when you loose vacuum in the manifold and the bypass valve shuts (eg 50% throttle...)
You won't even feel it until you get into the throttle pretty good. Also, It's not like a turbo and it won't sneak up on you and spool all of the sudden. You should have full control with the throttle with no surprises.
However, we all know how the VVTI kicks in on these motors.. so it might feel a bit angry when that kicks in and it gets near good VE.. but hard to say until you drive one with it and feel the tune/tq..
I think you are no more likely to break a diff or CV with this kit. If you have a heavy foot and a :flamethrwoer2: attitude, you can break it easy in stock form. More power on tap is not going to change that (especially in 4L conditions).
I hope people don't get this kit and try to turn their 5th gen into a Raptor/side by side or even worse.. .a rock bouncer. It won't be a good outcome.