yes this is the kind of things that makes building cars so much fun because people always say it will never be fast the a few months later you show them how wrong they were :)
yes I had the update done and a month after the car started shifting hard then I got in it one morning for work put it in reverse pressed the gas and the car didn't move the engine still revved but the car wouldn't move and it wouldn't go past 20 mph going straight
yes I would recommend changing them at 100,000 miles I changed mine at 80,000 miles just to be safe I used the NGK coil pack on mine way better then stock and no issues plus comes with 3 year warranty
I had my CVT go out at 80,000 miles it is very true I had mine replaced but it really depends on how far you drive I travel a lot for work so mine went out pretty quick
it does it electronically so it could be a flaw in judgment of speed iv never had this issue with mine so I would recommend taking it back to the dealership for inspection