if you have a northeast emission truck or a california emission truck you will set codes if you do a cat delete, they will be egr flow codes, any other trucks you will be ok.
my kitty fell off fer the mbrp turbo back! and now I have a smell /odor like alcohol or something ...what could this be!do I need to get a fingerstick?my truck is a fe9.I have blocked the egr also
thanks for the info !there is no engine cel light on .hopefully it will stay that way.I was somewhat confused as to loosing the kitty and no back pressure on the exhaust and blocking the egr. I have read a lot on this subject and am trying to get edjumacated some more.lol