All original 82. With a cracked convertor. I've been noticing bad gas milage--how should I handle this? Would luv more POWER

 

Sell all three cats if they still have comb inside to a online recycler and use the money to put towards a new stet up. You should be able to net approx. $125 or more for all 3 cats if they have good comb inside.
You don't need to take the comb out, you send them the entire cat.
I always take my cats in for recycling because its instant $$$$ to put towards something else.

 

Just a quick serahc turned up these guys I am sure there are others.
SellYourCatsDirect.com - We buy scrap catalytic converters nationwide!
Large cat $136
Small precats $33
So, there is over $200 in what can be scrapped for something better flowing.