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Choice between two Cat Converters

Old 08-09-2015, 11:41 AM
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Choice between two Cat Converters

Hi Everyone,

I am split between two catalytic converters if anyone can help me. I have a 2004 Mazda Rx8 and the cat is finally dying. I am going to replace it with one of the two below (unless anyone can help me out with some third part in site). I would really appreciate the help if anyone is willing to take a minute to look into the two and let me know the differences or which would be the better buy. The cost of the two is not an issue.

1)
MagnaFlow DF Converter 23909: Advance Auto Parts

2)
Walker Direct-Fit Converter 55531: Advance Auto Parts

Of course the price of the two is different. But the lack of detail on both is killing me. I would really appreciate any assistance with this. I am tired of the getting the look when my car takes 10 seconds to start and I want to make sure I keep the engine good for as long as I can. I know this is a huge problem for keeping the engine working at top notch quality if it isn't maintained properly.

Again, Thank you for the assistance if you have an in site or recommendations.
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Old 08-09-2015, 11:42 AM
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Oh, and I am comfortable doing the work myself. Just not the welding.
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Old 08-09-2015, 11:44 AM
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There is a huge cat thread somewhere on here that covers those 2 options.

Are you sure your cat is bad?

Why does your car take 10 seconds to start? That doesn't sound like a cat problem to me...

https://www.rx8club.com/new-member-f...causes-249529/
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Old 08-09-2015, 11:57 AM
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I have been researching the checks for the systems and what occurs / what are the clues to what is bad. I have a ton of pressure before the filter and barely any pressure behind. So the cat is clogged for sure.
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Old 08-09-2015, 11:59 AM
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And thank you very much for that thread. That will come in handy in the future and now.. But everything is pointing to cat even the mechanic was saying the cat is a huge issue. Another mechanic thought that it might be time to replace the engine, but I am doing everything I can no to do that...
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Old 08-09-2015, 12:02 PM
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How are you measuring the pressure? That sounds suspicious as there is nothing in the ECU that measures pressure.


Your problem doesn't sound like a cat problem. If your problem is only when hot, get a compression test at a dealer. If it's all the time, replace your ignition.
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Old 08-09-2015, 12:05 PM
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I had a buddy drill a hole a very tiny hole and put a pressure gauge in when I started the car and let it run for a bit. The pressure before the filter was extremely higher than the pressure after the filter.

I hate the ignition tested twice. Both said it looks good.
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Old 08-09-2015, 12:06 PM
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Thank you all for the input. I really appreciate it.
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Old 08-09-2015, 12:06 PM
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By "filter" do you mean the cat element? (that isn't a filter at all)

I keep thinking air filter when you say it
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Old 08-09-2015, 12:10 PM
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Yes I am sorry. The cat element.
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Old 08-09-2015, 12:13 PM
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Gotcha. That is a great way to test the cat actually, i wish it was possible from the factory.
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Old 08-09-2015, 12:19 PM
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Would you happen to have any advise on which cat would be the best option? (The exhaust is also doing that spitting noise constantly when the car is idling which again leads me to the cat. I am going to take a video of the car idling lat this afternoon and upload it.) Oh and the low power at lower RPMs.
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Old 08-09-2015, 12:31 PM
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Since I personally hate cats, and don't think they should ever be on a rotary, I can't provide any positive opinion about any of them. Many burn out way too fast on top of the general distaste for them.

But perhaps this thread will help: https://www.rx8club.com/series-i-aft...s-cats-210330/
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Old 08-09-2015, 12:52 PM
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Thank you for the help!
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Old 08-09-2015, 12:57 PM
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Totally understand the motivation to fix the cat, but before making that investment you really should get your engine checked out. Hard starts are not a cat problem, they're an ignition or compression problem. If you had the ignition tested (how?), the compression is next. The spitting noise you mention has nothing to do with the cat either, if anything the cat would even out exhaust pulses, not create them.

That's not to say your cat isn't also bad, but the cat is something of a canary in the engine trouble mine. It doesn't clog for no reason.

Last edited by Loki; 08-09-2015 at 01:00 PM.
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Old 08-09-2015, 01:15 PM
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I had a full check up on the engine. Replaced the ignition and made sure all cables and lines were good and in tact. The cat is for sure going bad, so before spending the money to replace the engine which I plan to do in a few thousand miles. I want to take care of this first.
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