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Old 11-02-2017, 10:38 PM   #1
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Need cat and exaust oem

Moved to MA and it won't pass inspection. Need a cat and everything. Let me know! I'm in Chicopee...can travel, I have a truck.
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Old 11-05-2017, 05:17 PM   #2
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I may be willing to part with my stock exhaust, depending on what you had in mind to spend. The exhaust has 51,xxx miles on it- it's the original system on my 2009 Touring.
Let me know what you were thinking!
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Old 11-06-2017, 10:50 AM   #3
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S1 or S2?

Are they actually requiring you to get a full OEM catback or is it just the cat they're concerned about?

Shipping will be murder on the catback but I do have both for sale:

https://www.rx8club.com/rx-8-parts-s...4/#post4842239

https://www.rx8club.com/rx-8-parts-s...atback-266605/
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Old 11-07-2017, 09:03 AM   #4
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Working it

The dealership is working on the steering recall right now so when I get it back I’ll figure out what I really need. The guy doing the inspection just said the exhaust can’t be modified. I’m going to get the dealership to tell me what the min is for MA. My understanding is that it can’t be louder. Mine is fairly loud if you get on it!
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Old 11-07-2017, 09:04 AM   #5
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S1 2004

It has a Mazda reman engine with about 12k on it. Nordic Green, GT. Love it.
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Old 11-07-2017, 01:52 PM   #6
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My understanding is that it can't be louder. Mine is fairly loud if you get on it!
Which mid-pipe do you use?

RX-8s are pretty loud even when stock, really.
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Old 11-07-2017, 03:10 PM   #7
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Not having a cat will definitely change the sound and make it louder. If you midpipe doesn't have a resonator then it's even worse.

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Originally Posted by UnknownJinX View Post
Which mid-pipe do you use?

RX-8s are pretty loud even when stock, really.



Mine wasn't. Heck, even with a high-flow cat in my midpipe and Tanabe exhaust it's still pretty quiet.
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Old 11-07-2017, 03:59 PM   #8
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Originally Posted by NotAPreppie View Post
Not having a cat will definitely change the sound and make it louder. If you midpipe doesn't have a resonator then it's even worse.

Mine wasn't. Heck, even with a high-flow cat in my midpipe and Tanabe exhaust it's still pretty quiet.
Maybe I am exaggerating, or I just drive the car hard. The car is a bit louder than the V6 Accord I had, but it's definitely not ricer loud.

Anyway, most cheap resonators won't last in our exhaust. If a resonator uses packing, then it will be blown out over time.
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Old 11-10-2017, 03:42 PM   #9
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Here is what I have

so I think a have a CAT and mufflers, I’ve never really looked at it before because well I never needed to.Looks like something was here
CAT? It has an o2 sensor on it
Part of the manifold?
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Old 11-10-2017, 03:46 PM   #10
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Last one

Mufflers
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Old 11-10-2017, 06:07 PM   #11
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Yeah, that's an aftermarket setup and a bad one at that.

There is no resonator as far as I can tell; it looks like a straight pipe with a cat welded on. Your car probably doesn't sound all that great and is loud as hell.

OEM cat looks like this(from my S2, S1 is similar):



Here is a proper mid-pipe setup with a single resonator(BHR mid-pipe + HJS Tuning cat):



This is what it looks like installed:





Read this page for more info on mid-pipes for our car.

Is there any indicator of which brand of cat it is? Cheap cats either will get melted by the heat our engines generate, or they simply don't contain enough of precious metal to eliminate the stank.
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Old 11-14-2017, 08:46 AM   #12
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a picture is worth a thousand words! Thank you for the info. I would like to quiet this car down a bit so if I decide to not go back stock, do you guys have any suggestions for a good “ silent” system?
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Old 11-14-2017, 02:07 PM   #13
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Originally Posted by Bullsinn View Post
a picture is worth a thousand words! Thank you for the info. I would like to quiet this car down a bit so if I decide to not go back stock, do you guys have any suggestions for a good “ silent” system?
BHR mid-pipe is considered the best exhaust system for RX-8 here. It uses an unique resonator design that doesn't use packing and will last forever. Also sounds very OEM, just a little deeper.

As for the cat, BHR offers a cat option which will be adequate for street driving and anywhere outside of CA and NY, but won't hold up during track use. HJS makes cats that hold up during track use, but they are very expensive and you have to get them from Germany.
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Old 11-14-2017, 02:18 PM   #14
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Well, you've got two components:
1) the midpipe (which should have a cat and a resonator)
2) the catback

Both will have an impact on volume and quality of the sound. I would start off by dealing with your current midpipe setup.

You'd be surprised how much a good catalyst and resonator can quiet things down. If you aren't getting a P0420 or P0139 code then your cat is probably in good shape and you can just have an exhaust shop weld a resonator in downstream from it.

If you want to get an OEM midpipe (with cat and resonator) PM me and we can talk price.
https://www.rx8club.com/rx-8-parts-s...4/#post4842239

Once you have that sorted, you can decide if the catback is still too loud. Making a choice on which catback to use is tough unless you want quiet. Most aftermarket systems are designed to either be louder or freer flowing (which generally correlates with being louder). Really, the quietest option is going to be OEM.
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