^ The warranty honda gave me on the stock cat was 7/75 and my Accord has over 100k on it, so it wasn't covered. The engine in my car is the F23a4 ULEV which is probably why I had such a big problem with high flow converters. I couldn't find anyway to bypass the check engine light so I just purchased a more restrictive converter. My car doesn't run as good with the new converter but I guess it's better than having a check engine light. I was burning alot of fuel with the high flow converter so it wasn't worth it.