Exhaust baffle/ box structure between cat and resonator?
 

I searched and could not find anything definitive on this forum or elsewhere so forgive me it has been discussed. Pictures that show the underside of the 86 there is a device inline with the exhaust between the cat and resonator. It is a small box with a rounded side. It looks somewhat like a mini branch resonator but it could also be some sort of sound baffle. Does anyone know precisely what this is? I have not seen such a device on any other car. I have seen baffles on the BOSS's side exhausts and I have seen branch resonators on aftermarket systems but none look like this structure. Any Ideas?

Have a pic?

Here's a few pics but I don't see this box that you speak of.

http://photos.motoiq.com/MotoIQ/Proj...P1060324-M.jpg

http://farm8.staticflickr.com/7185/6...7780d2ac_b.jpg

It's closer to the engine. You can see the resonator in those pics, it's upstream of that.

Is this what you are asking about? On the headers?

http://www.ft86club.com/forums/showt...?t=2636&page=4

http://www.tune86.com/sites/default/...ow_2011_72.jpg

He's talking about this bit:

Attachment 6396

Looks like a pre-cat. My old 02 Spec V had one. Tt caused a lot of problem for spec owners. The pre-cat woud degrade and bitw were getting sucked back into the head. I had a header on mine so the pre-cat was removed as it was a port of the exhaust manifold.

Oh, I just saw the diagram. Not exactly the same as what i had but could still be a pre-cat. Not uncommon for vehicles to have multiple cats...meow

Can't be a pre-cat that far down stream. Probably just another resonator.

+1

^Also, its downstream of the CAT so its not a pre-cat.

Yeah it would make sense if it was a resonator I've just never seen one look like that, also, I've never seen 2 resonators so close together. I have a hunch there might be something else to it, perhaps something for the tunners.

Someone pointed out in an older thread that it looked like a Helmholtz resonator, I have no idea how noise suppression is usually carried out but I assume it's to tune some certain frequency band.

could be the cause of the torque dip.

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Everything that looks like an anomaly is the cause of the torque dip, sheesh i thought everyone knew that....


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Hey, my post ended the trolling for this thread

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