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Old 10-03-2016, 10:46 AM   #1
jdance30
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How should I quiet her down?

So I've driven the E30 for about 1k miles and one thing I cannot stand is the exhaust. It sounds good, but is WAY too loud and drones like hell on the interstate, headache ensues after a 15 minute drive. I'm looking for you guys advice as to what I should do about quieting her down. She's a 1986 325, the glorious eta, with no cat, no resonator, just an unknown brand muffler in the back.

I've done some research, I know very little about exhausts, and have come up with adding a: high flow cat, resonator, or glasspack. I've been leaning towards the running the glasspack with the muffler I have now to keep cost down. Have seen a few posts about this option.

So here's what I'm here to ask, with my muffler, which one of these would be the best to add to eliminate most of the drone? Or any other ideas you've got for me. Sound really doesn't mean THAT much to me, mostly I just want the drone gone or mostly gone. Let me know what you think. Thanks guys.
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Old 10-03-2016, 11:13 AM   #2
Streichholzschächtelchen
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Glasspacks go bad eventually. Immediately if you soak the glass in gas and light it on fire lol. I'd get a Vibrant resonator to tone it down.
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Old 10-03-2016, 11:14 AM   #3
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Get a long resonator
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Old 10-03-2016, 04:23 PM   #4
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No cat no resonator, no name muffler...seems you answered your own question
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Old 10-04-2016, 01:53 PM   #5
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resonator or second muffler... and if it's a 3" exhaust, I'd lean toward the second muffler option.
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Old 10-05-2016, 10:27 AM   #6
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So the consensus seems to be for a resonator. I don't think it's a 3", as I haven't been able to measure it, but I will consider a second muffler if it is. I looked into Vibrants resonators and what length would be the best to go for? Or consider the ultra quiet resonators? Thanks for the input though guys, really appreciate it.
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Old 10-05-2016, 10:34 AM   #7
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Originally Posted by jdance30 View Post
So the consensus seems to be for a resonator. I don't think it's a 3", as I haven't been able to measure it, but I will consider a second muffler if it is. I looked into Vibrants resonators and what length would be the best to go for? Or consider the ultra quiet resonators? Thanks for the input though guys, really appreciate it.
I'm going to be running a Borla Pro-XS as a mid muffler and a Vibrant StreetPower at the end. All 2.5" tubing. It should be loud when you get on it but it should drone that much at around 3k rpm.
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Old 10-05-2016, 11:38 AM   #8
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Magnaflow makes inline mufflers that are better than the vibrant options because: they are multi-level, not single material packed, and the form factor is better. The Vibrant inline are oval, whereas the magnaflow are circular. look up the magnaflow 14419.

The best option would be to get a proper prefab exhaust system, or start over with a quality muffler using an inline muffler or at least resonator.
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Old 10-06-2016, 11:37 AM   #9
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I'm leaning more towards a redo of the exhaust, I would hate to weld in a resonator or second muffler and still have the same problem I have now just dampened a little bit. And the unknown name/quality muffler could be doing nothing to help now for all I know. I'll weigh my options and go from there. I've got the exhaust out of the car as I've got the rear subframe out, so I wanted to get some input while I have the chance. Thanks guys!!
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Old 10-06-2016, 11:40 AM   #10
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It's an eta. Just get a stockish exhaust for a couple hundred bucks and be done. Free flow doesn't do anything for an engine built with asthma.
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Old 10-06-2016, 11:54 AM   #11
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It's an eta. Just get a stockish exhaust for a couple hundred bucks and be done. Free flow doesn't do anything for an engine built with asthma.
Seconded.

If drone is giving you headaches, find a local exhaust from an eta, or pull one from a junkyard.

Cheap, solves your problem, and you can either modify your current setup or sell it to someone who wants a loud exhaust.
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Old 10-07-2016, 06:24 AM   #12
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Seconded.

If drone is giving you headaches, find a local exhaust from an eta, or pull one from a junkyard.

Cheap, solves your problem, and you can either modify your current setup or sell it to someone who wants a loud exhaust.
This was my original plan months ago, but gave up after not being able to find one locally or anywhere near me for that matter, however I am still on the lookout! Really, reverting back to stock or going for a whole new exhaust seems to be the way to go for now.
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Old 10-07-2016, 06:25 AM   #13
jdance30
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It's an eta. Just get a stockish exhaust for a couple hundred bucks and be done. Free flow doesn't do anything for an engine built with asthma.
Got a good laugh out of that last sentence, will definitely consider if I can find one.
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