I'm getting my computer tuned, and I have a couple of questions. First off, I'm having MadZ28 do it, now my question is on his form he asks about increasing shift firmness, does this put excessive wear on the trans? Also what would I get out of having the EGR and AIR disabled? Can I just leave them hooked up and have them disabled? Does doing this affect drivability or gas mileage? Thanks in advance for any help.