Is it necessary to reset your ECU after installing a mod?

If I installed a AEM intake on my 00 z24, should I reset the ECU? And can this be done by unplugging the neg from the battery and stepping on the brake for a few secs?

Magnaflow exahust to come within the month, so should I wait to get it done then have it tuned?

no, no minor bolt-ons will effect anything enough to make the stock ecu get outa wack. only if you add a major performace upgrade i.e. turbo or s/c will require a new or reflashed ecu. and some kits even come with a replacement.

no you dont need to, and no, thats not how its done,

Nope... install it and kill your first tank of gas with your lead foot.. because everyone love that new sound that your car will make.