I'm shopping around for cats and I'm wondering what I should be spending. Online direct replacements are anywhere from $150 to $190 and TT has a 'high flow' cat for $225. Also, if I buy the cat online and have a local place put it on, what is a typical cost range? $30-$40? I called over to a Meineke and they didn't seem to up on cats with o2 sensors.