Had the magnaflow full system installed today for $100.00 bucks man what a difference in sound,now it sounds like a muscle car.not sure how much power was added,but it sounds real good. one thing bothers me some is the installer put anti-seize on the O2 censor threads i'm not sure that was the right thing to do.I had no problem with the check engine light coming on at all,the idle is just a little ruff, not sure if the change caused that or the gas i put in it on the way home ,or the computer trying to adjust it's self .anybody else who changed the complete system out have any problems