Question #1 / Cat Conv. Repl.

Folks:

I'm going to install a new cat back exhaust on my 99 Tacoma 4WD XCAB TRD.

Since i'm already down there, and since the old Girl is running a little sluggish, I thought i'd replace the Cat as well.

I want a free-flow cat and found a couple of companies that make them (welding required of course), but just for my own interest, I called my 'discount Toyota parts dealer' to get a quote on a new, OEM Cat.

$795.00 with the discount.

Question(s):

1. Why are 1999 and up cat's so high when 1975-1998 are like 0 bucks.

1. Does anyone see any potential problems with a welded on free flow cat? (O2 sensor issues). This new cat has the recepticle for mounting the sensor.

Walt Birmingham, AL