Nobby,
If you read the original thread carefully, you would find the "environmentally friendly" bit a little less interesting. I didn't preclude buying a $600.00 cat, merely stated that if I could get satisfactory performance for $60.00 why would i spend the extra. However, there was some good info from some of the replies, and it would seem that as I only drive the car in the summer for maybe 2,000 or so miles, either a universal unit will satisfactorily fill the bill, or I can do without one altogether. I'll probably go for the universal unit though. Thanks to the folks who responded.