Catalytic Converter problems...Perhaps even bigger

[rcisneros4]

I own a 2007 STS and I am having problems with the Catalytic converters (I think). They begin to heat up quickly. I have replaced them before and I admit, the first time they were cheap parts. At the time I didn't have enough money and I knew a guy who would help me. (I only paid around $450) Then they began to make rattling noises soon after. Then I took it to a muffler shop a couple months after (rarely using the Caddy). And had them fix one (b/c it cost as much as the previous fix). Plus I asked the mechanic if it would still be ok with only one fixed, he said yes. 30mins later it began making rattling noises again, and somehow if I turn to the right, it sounds like something is dragging on the pavement. I really want to get this problem solved but I am no mechanic. So if you know a thing or two, please notify me.

[KHE]

Catalytic converters do get hot. That is part of the process by which they function. If there was something wrong with the original units, your car would have set a trouble code. The originals are warrantied for 8 years/100,000 miles I think.