for you guys out there that have the K&N cai on your ss/sc and get a cel. the only way to get that light to stay off is to stay off is to change the K&N filter and use a AEM dryflow filter and to get a gm stage 1 kit. i got it installed in my car and the light has not came back on

 

ive had the K&N intake for almost 6 months with no cel or no codes thrown.

 

your the first one that ive heard of to get just stage 1. Grats, its just a lean code so your new tune probably runs richer than stock therefore eliminating it.