SilverrbRX8

I keep reading about reflashing or resetting the ECU, do i need to take my car in for them? can something be done on my own? my car is a month old and i have upgraded the intake to the REVI RAM AIR...thats my first step soon to do more...do i need to reset something? also to those claiming rattling, i noticed my car idles real quiet when adding octane booster with jet fuel along with the highest avail octane gas u can get.....runs greatttttt...and the REVI intake makes a sh*&load of a diff. i had the KN in for a few days and it was awful sounding and ran like crapppppp. anyway someone let me know about this ECU reset stuff. THANKS ALL!