New Gears... New Questions

[SLVR04GT]

I'm getting 3.73s on Thur... and I was wondering 1.How much my RPMs are going to go up. 2.How far off my MPH is going to be?? I don't have the money for a Speed Cal right now... So whats my best bet in the future keeping in mind, I'm trying to pass it off as being under warranty still. So I guess, Programmer or Chip, and which one will give me the tune and power? Thanks Guys!!