So i have this loud knocking noise. I thought it was something serious but i am now 90% sure its one or both of my cats. Since i have been contemplating LT's for a while now...no better time than the present to get em and wrap up the exhaust all at once. I currently have 2.25 true duals. I saw Moregrips thread with his exhaust and high flow cats. Is that the best way to go while im replacing them? Any other reccomendations appreciated...

I am kinda puzzled why they would go out with only 60K miles. My only real guess is that my tune is rich to be conservative..My truck runs good but does use an excess amount of fuel...so thats my take.. Thanks guys...

Matt

 

GM covers converters under a 8 year 80,000 mile warranty, if you want new converters just go have them put on. Its free.

 

Will i get any flack from them? Ill just put my stock tune in there and i should be fine ya? I have not had good experiences with dealers in my area. I hope this isnt something they will give me crap about.. Thanks ill look into it and follow up...

Matt

 

Well ill be dropping it off next week to get it looked at. If they do it with no problems ill be that much closer to the long tubes. I was figuring a few hundred for cats. Wish me luck..

Matt

 

there should not be a problem. if there is, its worth a drive to the next closest dealership. good luck.