Hi Guys can anyone help...I think I have a 02 sensor fault as my engine management light comes on now and then...and over the last couple of weeks one of the cats has started chattering ( the expensive one on the left of the car)...can anyone tell me is the standard XFire exhaust Stainless steel and can I buy a replace ment cat and have it welded in ..and any recommended replacements..I am in the uk and we have strong emission rules...Thanks Chaps.

 

My rear cats are hollowed out and it passes obd emission tests.
Not sure if that helps you but wanted to give you the info.

 

I know RockAuto has them for sale. I can't recall the price though.