Yep It's official...I'm a pussy. (resonator installed) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-13-2008, 02:05 AM   #21
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What about a metal core cat? Be a little PC and shave a few db.
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Old 06-13-2008, 10:49 AM   #22
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We ran a dynomax bullet on a spec miata for years and never had a problem. But I can say that it doesn't cut the sound down like a big glasspack or cat.
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Old 06-13-2008, 10:57 AM   #23
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Quote:
Originally Posted by emilio700 View Post
What about a metal core cat? Be a little PC and shave a few db.
I'm still good for 1.5 years. I'll be throwing a 200-300 cell spun metal core in there...eventually.

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We ran a dynomax bullet on a spec miata for years and never had a problem. But I can say that it doesn't cut the sound down like a big glasspack or cat.
I don't see how one could collapse....all a resonator is, louvered or not, is a drilled pipe with a shell welded around it. the dynomax happened to have holes drilled out, while the louvers have slots punched in. Unless they use some thin *** metal and drill the too liberally, I don't see it happening.


as far as testing....this may be a good chance to finally put the magnehelic gauge i have to work...
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Old 06-13-2008, 10:58 AM   #24
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That's what I meant, bullet muffler. We couldn't figure out how they collapsed either. The outside of the pipe looked perfect. The inside looked like someone took a pair of vise grips to a coke can. These were all mounted mid-exhaust with no cat, so our theory is that they have serious problems dealing with heat. I've seen it first-hand twice and heard about it from quite a few others.
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Old 06-13-2008, 11:09 AM   #25
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I've also seen resonators and flex sections buckle inwards.

In fact... the rattle/vibration I'm dealing with is either a joint in my exhaust or something crapping out in my resonator already.

Hopefully I figure it out tonight.
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Old 06-13-2008, 11:16 AM   #26
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Fortunately (or unfortunately) my massive exhaust rattle turned out to be the heat shield on my universal catalytic converter - which is being swapped out for my 200 cell metal core this weekend... if the USPS decides to finally deliver my flanges.
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Old 06-14-2008, 03:11 AM   #27
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yup, thats official
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Old 06-14-2008, 02:25 PM   #28
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Going with clamps for now untill I can get it welded. Simply shoving it on my tailpipe and it reduces the overall volume just a tad, removes a but of resonance so it's not so annoying, shoudl be good. should have it finished in a bit, it's hot as a coffee mug out there!
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Old 06-14-2008, 02:42 PM   #29
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Quote:
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We ran a dynomax bullet on a spec miata for years and never had a problem. But I can say that it doesn't cut the sound down like a big glasspack or cat.
It does help smooth out the sound a bit...not sure if it makes it quieter.
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Old 06-14-2008, 06:56 PM   #30
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Drove about 45 minutes in stop and go traffic, much improved. The loud ricer whine is gone when I get in boost, and the overall booming resonance of the exhaust is gone. I iz happier.....I'll get some vids tomorrow when it's not raining.


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