I posted this a week or so ago.
Well I found this site http://members.aol.com/SportsCarConvert/Lexus.html
they have some exhaust parts for our cars. this is what they told me.
"The application for your '95 Lexus GS300 does use two converters. The front converter is a single part along with the header pipes. Yes, pipes... according to the information I have here there are two pipes that lead into the front converter (the header pipes and the converter are a single unit).
This is our part number 2132.5924
The cost for this Max-Flow cat is $282.86
There is also a rear converter on your car and this you may be looking at and figuring that it is just a "muffler". It has a single pipe leading into it (pipe and converter are a single unit) and the oxygen sensor is screwed into the front of this pipe
This is our part number 2129.8225
The cost for this Max-Flow cat is $214.29
Please note that you do not have to replace both the front and the rear converters if only one of them is "bad".
So I am sure it is my rear one that needs replacing. I would just like a diagram or somethin to see all the exhaust parts from the manifold to make sure. We'll see. I just don't even want to bring my car somewhere to ask them to hack up some exhaust pieces, if that was the case they should just be able to tack weld the leak, and near me I don't really have anybody that I trust.