I am in the process of doing the AIR pump delete right now myself. I just sent the PCM out for reprogramming. The check engine light has been on for months with the DTC 0410 (secondary air injection, a.k.a. smog pump). Something was wrong with the system, but I'm not sure what. Never had any driveability issues or anything else bad happen. I can't think of any reason that disabling or removing the smog pump would do anything besides trip a code and light up the light.