Hi guys i have just picked myself up off the floor after being told that my pre cat has gone on my IS200 SE and the bits may have been blocking my main cat. Not sure wether it is damaged. Lexus has said that it will cost me £617 for a replacement. Does any one no where i can get them cheaper? i believe my exhaust is stainless steel factory fitted. I not sure whether this is standard. Is there any quiet replacemnt exhaust system that may be better and more worth while.