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Old 11-06-2013, 04:35 PM   #1
eugeneutopia
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Default RE-pack Invidia mufflers?

I admittedly have very limited thread searching skills. The fab/welding section might be a more appropriate container for this subject, but I don't think it gets the amount of visibility that this one does, not to mention it's kind of a grey area.

So... I searched for "repack" and "re-pack" as far back as most of 2012 and didn't see anything that addresses my question. Sorry if it's a topic that's been addressed previously.

There, disclaimers are out of the way.

Being a motorcycle guy at heart, when a bike's exhaust starts to get louder than you're wanting it to be, the typical fix is to take the end cap or rivets off and repack the baffling.

I'm on my 2nd set of Invidia Q300 mufflers. I started with a full cat-back (catless) system and now the setup include equal length mufflers. It (they) start out nice and mellow (which is what I'm looking for), but within 15,000 they get REALLY loud. No exaggeration, I've had people flip me off on the road, I got dirty looks from anyone who bothers to look and one of my neighbors smashed my windshield (I think the exhaust is why). I suspect the baffling goes bad really quickly, compared to other exhausts. Maybe it's just me. No water/rust in the mufflers that I can see. I've replaced the mufflers (only) from the 1st Q300 with identical nearly-new ones from a different Q300 (same application). Still loud after about 15,000 miles.

My question is this: Is re-packing the baffling in the mufflers a viable option? I'm sure I can get someone to open them up and weld them back; probably for cheap or maybe even free (good buddy discount). I can repack them easily.

This is what I'm referring to. Sorry it's Honda based, for those of you that may hold a bias. Obviously it's possible... I'm looking for opinions on if its a good solution, or if something may make this "fix" inadvisable?

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Old 11-06-2013, 06:58 PM   #2
superdonkey23
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I would sue your neighbor and buy a better exhaust for starters
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Old 11-06-2013, 07:04 PM   #3
Cathexis
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Quote:
Originally Posted by superdonkey23 View Post
I would sue your neighbor and buy a better exhaust for starters
The q300 is a fine piece. Love mine. 20,000 miles and no issues whatsoever same noise level as new. A quiet exhaust compared to most. I am using nvidias high flow cat dp as well.
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Old 11-06-2013, 07:07 PM   #4
eugeneutopia
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Originally Posted by Cathexis View Post
The q300 is a fine piece. Love mine. 20,000 miles and no issues whatsoever same noise level as new. A quiet exhaust compared to most. I am using nvidias high flow cat dp as well.
That is my understanding as well.
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Old 11-06-2013, 07:09 PM   #5
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Quote:
Originally Posted by Cathexis View Post
The q300 is a fine piece. Love mine. 20,000 miles and no issues whatsoever same noise level as new. A quiet exhaust compared to most. I am using nvidias high flow cat dp as well.
They are hit and miss from my experience, on some pieces the baffles blow out pretty quickly, just as the OP said. If I were you OP I would try out the Cobb or Nameless catback. Both of those can be made very quiet at normal speeds, but really open up at WOT.
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Old 11-06-2013, 07:11 PM   #6
eugeneutopia
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Quote:
Originally Posted by superdonkey23 View Post
I would sue your neighbor and buy a better exhaust for starters
I'd press charges if I knew who it was and had proof. Q300 is regarded as a very good exhaust.... Just not in my situation apparently.

Opinions of the exhaust and attempts to troll aside, anyone have an opinion on the idea of repacking the exhaust?
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Old 11-06-2013, 07:12 PM   #7
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Originally Posted by superdonkey23 View Post
They are hit and miss from my experience, on some pieces the baffles blow out pretty quickly, just as the OP said. If I were you OP I would try out the Cobb or Nameless catback. Both of those can be made very quiet at normal speeds, but really open up at WOT.
Awesome, thanks. Glad to hear it's not just me having the experience.
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Old 11-06-2013, 07:14 PM   #8
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Awesome, thanks. Glad to hear it's not just me having the experience.
If you do go with the nameless make sure you get the 5" mufflers at the axle back and a muffler in the mid pipe otherwise it will be pretty damn loud on a cold start and your psychotic neighbor might smash some stuff again.
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Old 11-07-2013, 01:10 AM   #9
shiplemw
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You are proposing to replace or add additional amounts of fiberglass roving. Fiberglass roving is commonly used to dampen high frequency noise, usually above 4-5k hz. I don't know the internal construction of the Q300 muffler system. The roving can blow out of the muffler, it all depends on the design, quality of construction and operating conditions. It is possible to replace your fiberglass roving and it should help your high frequency noise. It won't be exact though. If you don't have a resonated midpipe you can add one to your current system and that should help reduce the noise as well.
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Old 11-07-2013, 02:26 AM   #10
eugeneutopia
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You are proposing to replace or add additional amounts of fiberglass roving. Fiberglass roving is commonly used to dampen high frequency noise, usually above 4-5k hz. I don't know the internal construction of the Q300 muffler system. The roving can blow out of the muffler, it all depends on the design, quality of construction and operating conditions. It is possible to replace your fiberglass roving and it should help your high frequency noise. It won't be exact though. If you don't have a resonated midpipe you can add one to your current system and that should help reduce the noise as well.
Excellent, thank you!

If the exhaust is acceptable when the muffler is "new" & deteriorates over time (as suggested by the increased db) would you suggest that the resonated mid pipe is a worthwhile addition? My thought is that if the baffled portion of the exhaust is good at the early stages of its life, there must be some portion degrading, making the repair or replacement of that deteriorated part the most logical step. Would you agree or would you suggest a different approach?
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Old 11-07-2013, 09:31 AM   #11
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Most times the packing doesn't actually blow out of the muffler it just gets filled up with carbon and once all the empty space in the packing is filled up with carbon and soot it can't do its job.

Here's a pic of what came out of my rattling straight through eBay muffler. It was still pretty effective at quieting it but was louder then when I first put it on. You can see some of the packing was still fluffy and some was just solid carbon. Was really easy to tell yanking it out that some wasn't doing anything anymore
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Old 11-07-2013, 12:31 PM   #12
issueslude99
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25k miles on mine and still sounds the same as the day i bought it. I think its quiet vs other exhausts. Sucks you got 2 bad ones, talked to the company you bough from about the issue?
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Old 11-07-2013, 08:30 PM   #13
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25k miles on mine and still sounds the same as the day i bought it. I think its quiet vs other exhausts. Sucks you got 2 bad ones, talked to the company you bough from about the issue?
yea. I even had the credibility of the tuner behind me as well, but Invidia said that being catless and having an automatic transmission (at the time) is the cause for the additional volume. By the time it got obnoxious the warranty had expired. I don't think they had any desire to cover it anyway.
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Old 11-08-2013, 11:14 AM   #14
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If you can weld, go for it. But man up and buy the packing from burns stainless so it takes longer to burn up (thats the issue).
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Old 11-08-2013, 02:49 PM   #15
eugeneutopia
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If you can weld, go for it. But man up and buy the packing from burns stainless so it takes longer to burn up (thats the issue).
Cool, thanks for the product recommendation.
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