RBSOB,Your absolutely right,defeating any emissions device is a big no no,but on a 24 Valve,there is no Cat,and there is no EGR ,or thermactic air cleaner similar to the old gassers,so you are defeating nothing. If you were to remove a Cat,or defeat an EGR valve,and it were found it could lead to warranty denial,if the dealer wanted to make an issue of it(not likely).