Somthing I found out about the CAT. 8 years or 80,000 miles, is the emmisons warenty. My 98 SVT, has 71K so I fell into the warenty. If not a OEM Cat, from Ford is around 625.00.....ouch!!! Or just go to the SHO Shop, and get it for 99.00, and have a muffler shop weld it in for you. S#!T I could buy a whole new exhaust for 625.00.