yeah I get the same reaction from people I ask. I just dont want to give $2000 to the dealership to replace one Cat not both but one. I have taken the car in to the dealership and they tell me that I need a new cat. everytime I revv the engine I hear rettling noises coming from underneath the car. so I know one cat is bad. but my ultimate question is will a universal work and will there be any problems after I change them out.