Hi Steve,...welcome to the Club
Not sure but first thoughts are the phone may be in 'Driving Mode' which blocks texts, etc when it knows you are driving.
Let us know what you find out
Cheers, Trevor
Hi AJ....welcome to the Club
Hope someone gets back to you shortly, sorry can't comment personally on the pro's and con's but I would be tempted to talk to a few tuning specialists who could (hopefully impartially) give you advice on either stage 1 or 2
Let us know how it all goes
Cheers, Trevor