I just had a cat go out and was reading that some addatives can cause a failure, in this case it broke apart inside. This failure occured in about 2 or 3 days, maybe 30 miles or 40. I am gonna check out the motor a tad before throwing another cat on but just checking if its possible. BTW only 1 of 2 blew. I figure its a bad cat but ide rather it not happen again lol, so Im checking into all options.