I am not going to mod mine. I have zero experience in this category (one of the reasons I was interested in this forum - that and the USB thing), so I would love to hear other opinions. Guess that would be in tuning?
I have another story about a 4S that I will just
not talk about since this post went so well (not.)
I did discover that the extended electronic limitation that is supposed to kick in at 270 - did not...I hit an indicated 300 today, and it was still pulling. Mech at the shop says it will do 330 unlocked (indicated speed.) Glad I paid for that option.