speeddemon40 Posted September 26, 2018 Report Share Posted September 26, 2018 Anyone else have issues with their 96-98 cobra killing cats? Bought the car several months ago. Came with an off road pipe and mil eliminators, but the check engine light was on. Ended up putting a upr xpipe with hi flow cats on. After a few weeks, a cat started rattling. UPR was cool about it and sent me a new cat and credited me money to have it put on. Couple of days later, the other one went. Same deal except this time I had to pay for it to be cut off and welded back. Now a month later the rattle is back. I drive this car on nice days so it gets very few miles. Maybe 150 to 200 miles per month. Runs great, but at a loss for this issue. UPR just crappy or something else wrong? BTW, car just turned 70k miles. Link to comment Share on other sites More sharing options...
Prokiller Posted September 26, 2018 Report Share Posted September 26, 2018 its possible you aren't getting them up to temp to actually burn off. is the car tuned? you might be pushing too much fuel at it that the cats can't eat up Link to comment Share on other sites More sharing options...
speeddemon40 Posted September 26, 2018 Author Report Share Posted September 26, 2018 That's an interesting idea. Lots of short trips and infrequent longer ones.... Link to comment Share on other sites More sharing options...
Prokiller Posted September 27, 2018 Report Share Posted September 27, 2018 take it out for a decent trip and give it the business a little bit. get that exhaust nice and hot and see what it does. Link to comment Share on other sites More sharing options...
speeddemon40 Posted September 27, 2018 Author Report Share Posted September 27, 2018 43 minutes ago, Prokiller said: take it out for a decent trip and give it the business a little bit. get that exhaust nice and hot and see what it does. Are you saying to get the car hot to see if it goes away? It seems like every time it's started rattling was after a longer drive. Then the next time I drive it, it is worse. Link to comment Share on other sites More sharing options...
Prokiller Posted September 27, 2018 Report Share Posted September 27, 2018 when you say rattling, do you mean like a pinging/ticking type sound after the car is off? Link to comment Share on other sites More sharing options...
speeddemon40 Posted September 27, 2018 Author Report Share Posted September 27, 2018 4 minutes ago, Prokiller said: when you say rattling, do you mean like a pinging/ticking type sound after the car is off? Rattling while driving like a heat shield is loose. The inner part of the cat is actually moving around in the exhaust Link to comment Share on other sites More sharing options...
Blackmage Posted December 26, 2018 Report Share Posted December 26, 2018 might want to double check the tune if the car is modified. did you ever pull the codes for the check engine light? Link to comment Share on other sites More sharing options...
