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Old 05-26-2013, 09:17 PM   #1
LOW
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glass pack vs resonator



ok so my 318ic (m42) is straight piped to muffler but is way too damn loud, what will quiet it down and not make it sound like a ricer, which will sound better? a glass pack or resonator?
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Old 05-27-2013, 09:11 AM   #2
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18" resonator will be perfect
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Old 05-27-2013, 09:19 AM   #3
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a resonator will slightly quiet it down. the cat is what really blocks all the noise. I have dual 18" resonators on my car and its still pretty damn loud.
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Old 05-30-2013, 09:38 AM   #4
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Do you still have the stock catalytic on the car?

A good quality glasspack with large louvers inside will only restrict the flow a little but catch some of the raspy noise. 318's will still drone at lower RPM and on the highway. I've tried 4 different exhaust on my car including uninsulated resonators and mufflers that from my experience, sound very raspy and "throaty".

Try and fit the longest possible glasspack and muffler, even if you have to weld two 12" together or something along those lines. You wont lose any performance by giving the M42 a little back pressure and going with 2" pipe, high RMP power is all in the cam timing and chip tuning.

Last edited by Slowered318; 05-30-2013 at 09:52 AM.
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Old 05-30-2013, 05:47 PM   #5
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Quote:
Originally Posted by Steve30 View Post
a resonator will slightly quiet it down. the cat is what really blocks all the noise. I have dual 18" resonators on my car and its still pretty damn loud.
Gorgeous noise, but yes it is loud. I have a Magnaflow 2.5" cat and straight through muffler with my S52 and its pretty quiet while driving "normally".
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Old 06-03-2013, 06:56 PM   #6
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yeah ok i have a resonator on order, if worse comes to worse i will grab another if its too loud. spent about $2000 today on parts for the project, everything from exterior/interior to exhaust and power train... oh and some suspension, hould keep me busy for a bit.
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Old 05-03-2015, 08:12 PM   #7
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Quote:
Originally Posted by Slowered318 View Post
Do you still have the stock catalytic on the car?

A good quality glasspack with large louvers inside will only restrict the flow a little but catch some of the raspy noise. 318's will still drone at lower RPM and on the highway. I've tried 4 different exhaust on my car including uninsulated resonators and mufflers that from my experience, sound very raspy and "throaty".

Try and fit the longest possible glasspack and muffler, even if you have to weld two 12" together or something along those lines. You wont lose any performance by giving the M42 a little back pressure and going with 2" pipe, high RMP power is all in the cam timing and chip tuning.
A glasspack is also a muffler, isn't it? Asking it because I am looking for a new sound for my 318, and I dont want it to sound like a honda. So I am thinking about having a 18" resonator, glasspack, and magnaflow 11265 combo together. Or should I just run the glasspack as the resonator?

I am not sure if I want to have two mufflers (glasspack and the magna) welded on together. No idea how that would sound.

Last edited by partner103; 05-03-2015 at 08:17 PM.
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Old 05-04-2015, 01:05 AM   #8
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Sorry it was a little hard to explain myself in writing. I was just trying to put across the point that it was HUGE headache to make the M42 sound respectable and tolerable for extended driving. I would build an exhaust using the largest resonator and muffler you can possibly fit. Without enough dampening these cars sound like a beast because of the factory header. My thoughts are that the 12244 would fit and sound better, along with a 10424 if you're going with Magnaflow? But I would consider the technical and design aspects of exhaust are extremely complicated.

Also you may want to consider Stromung Exhaust, they seem to be quite popular with 318 owners. http://www.stromungexhaust.com/318i-cat-back.html My car is due for a new exhaust soon and I was considering this one. Because I no longer have a factory catalytic I was going to fabricate my own mid section using 4" long body resonator and high flow catalytic.

Other options that come to mind are Bosal, Billy Boat and Walker

Last edited by Slowered318; 05-04-2015 at 01:31 AM.
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Old 05-04-2015, 07:57 AM   #9
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I was looking at the Stromung and Eisenmann set up as well. Didn't find a clip of an m42 running either one of these sounding nice.

So, slap on a large resonator/muffler combo... or glass pack/muffler is way to go. These are the big questions in life?
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Old 05-04-2015, 09:32 AM   #10
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I guess people are generally displeased with the sound so they don't post up a video. LOL
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Old 05-04-2015, 11:17 AM   #11
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And that has me worried a bit. Spending the cash and not knowing if it will sound the way I imagine it would.
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Old 05-07-2015, 08:47 AM   #12
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If 15 years of tinkering with E30's has taught me anything... It's taught me that most aftermarket or "performance" products either don't deliver or don't fit, generally they are a waste of time and money. Aside from a few mods (I'll list out if you like) the most rewarding alterations I've done is fitting genuine BMW parts from newer or higher performance models (examples are medium case diff, e36/e46/z3 steering rack, m3 control arm bushings, ellipsoid headlights).

Have fun but have some faith in the team of engineers over in Germany that designed your car. I'm sure on the dyno and in the anechoic chamber they can design a better exhaust then Big Joe's muffler shop.
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Old 05-07-2015, 09:50 AM   #13
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LOL, true.
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Old 05-07-2015, 03:27 PM   #14
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For my S14 after the OEM exhaust needed replacing I had a 3in single pipe with a large center Magmaflow resonator and a Magnafow rear exhaust. It was... ummm... LOUD. On throttle, part throttle, off throttle it had great burbles and barks but was unlivable.

Changed it to dual 2in pipe with highflow cats and an Eisenman sport (not the louder race) rear. This was livable. Still louder than stock, still disliked by my wife.

The lessons learned:
- go with dual pipes if possible (less booming resonances in the cabin)
- get highflow cats (it really quiets it down)

Here is a clip of it at Mosport. The mic is external, mounted above the exhaust pointing down. So most of it is WOT.

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Last edited by GeoS; 05-07-2015 at 04:18 PM.
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