The 2002 Lexus ES falls into the 4th generation of this design and if equipped with a 3.0L V6 engine it has three catalytic converters, according to my contact at MagnaFlow.
The front converter is part # MF50821. The rear converters are parts # MF26214 and # MF50260. These are all bolt-on products; no welding is required. None of these items are approved by the state of California.
I have linked each of these parts, but please note that the product images on our web pages are not the... view full answer...