I have started hearing a loud rattle coming from under the car at low rpms, and I'm almost sure that it is coming from the passenger side cat. So my question is: do I need to replace both cats or just the one that is bad? I'm pretty sure that I would if I went with a high flow, but what if I used a regular one?

 

You could just replace the one but if one is bad chances are the other one wont take long to go bad.

 

I had two shops give me a price on this; one said 200-300, the other said 850. ?!?!

 

Parts and labor would probably be around 250.

$850? Ask them what they are smoking to charge you that much for an hour job.

 

Well, they said the cat was gonna cost 700. Lol, i'm not going there. I was just looking at Magnaflow high flows and I'm confused at prices differences. There is a "direct fit" cat for camaros that costs 300 and then there are some standard 3" high flow cats for about 100 (part# 99659HM). Would I be able to run the $100 high flows on my car that has the stock manifolds and y-pipe?

 

Yeah you could do that.

 

As long as the high flow cat listed for 100$ fits your needs it will work. Make sure its same size in and out... dont let them open the opening at all... if you got a 3 inch exhaust, you want a high flow with 3" in and out.local shops around here rob you with that ****

 

Well i have a shop replacing it right now. So how do i go about finding what caused it to fail? I wasn't throwing any codes til the cat went bad

 

why would they rattle thought.....

 

though...

 

I've heard that they will clog and/or come apart inside due to a number of issues one of which being overheating. I bought an OEM set here for $75 and they were like New. Seems there are people on this site that will still give you a GOOD Deal. Not everyone wants to rob you blind. lol