Author Topic: Exhaust Resonator (Read 6904 times)

oldtimer · « **on:** June 06, 2007, 11:14:03 PM »

Instead of adding to the old thread about modifying exhaust I thought I would start a new one. I have been on the phone, on the web and visited all of the local parts store to locate a "resonator" for my 1991 318is that is sounding like a "ricer" after I eliminated the cat, and from what I learned the stock resonator and replaced the muffler with a performance "Dynomax". I guess I need to install a resonator to hopefully eliminate the sound of a ricer. Someone in the forum suggested getting a perforated resonator from Jeg or Summit. Man am I having a rough time in finding one. Has anyone use a perforated resonator, if so where did you get it? I sure could use some help in finding one.

Since I discovered that my car sound this way I have not driven it. Any feedback will be greatly appreciated.

Alpine003 · « **Reply #1 on:** June 07, 2007, 11:52:15 AM »

I believe this is what I used on one of my cars before. Of course you can get the more fancy stainless steel versions too but this should last at least 3 years or more. http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_744702_-1_10265

Just measure the longest straight section of your exhaust and get a size similiar to that.

oldtimer · « **Reply #2 on:** June 07, 2007, 07:49:08 PM »

I know this will truely reveal just how much of an "oldtimer" I am. but from what I recall from date back "glasspack" are usually noise makers specially one's made by trush or is it just the name. When I first started to hotrod I used a Trush muffler to get some noisy sound. I don't mean to sound negative I will order one and weld it on. Thank you.

gearheadE30 · « **Reply #3 on:** June 07, 2007, 08:04:49 PM »

I'm looking into a resonator as well, and I have found that the Flowmaster Hushpower II is a pretty good choice. I think it was built with more of a V8 emphasis, but a few people on r3v liked them. Plus they are stainless and only $90.

Out of curiosity, what is the best resonator to get for our cars (I have a noisy Bosal exhaust) to get a deeper sound, including the original piece?

zav3n · « **Reply #4 on:** June 07, 2007, 09:02:10 PM »

i just recently had this problem. i took off my old dynomax cuz i just hated the "ricer" sound and put on a magnaflow straight thought thinking it would help but it didnt. mind you i cut off my resonator. so i went to auto zone spent 22 bucks picked up a cherry bomb and thew it on.

it help a little but it still has a raspy noise to it when you really step on it. hope this helps

-Zav

D. Clay · « **Reply #5 on:** June 07, 2007, 09:53:25 PM »

Go to a cheap independent muffler shop and have a universal welded in. They have them in different pipe sizes. I got one for $75 installed.

Alpine003 · « **Reply #6 on:** June 08, 2007, 12:05:11 AM »

Quote from: oldtimer;27362

I know this will truely reveal just how much of an "oldtimer" I am. but from what I recall from date back "glasspack" are usually noise makers specially one's made by trush or is it just the name. When I first started to hotrod I used a Trush muffler to get some noisy sound. I don't mean to sound negative I will order one and weld it on. Thank you.

Yes they will make noise if this is the only thing in the exhaust path. But when coupled to a muffler, it will help it quiet down quite a bit. Get a shorter one around 14" if you still want a pronounced exhaust note. The longer ones pretty much make it sound subtle until you get into the upper rev range.

As for stainless, unless the rest of your system is stainless, it really doesn't make sense to get one. Also remember that majority of the exhaust shops don't use stainless welds so you still have the chance of the actual weld rusting and braking off.

Cherry bomb at your local Autozone will probably work for a short while but remember some of the cheaper brands uses inferior packing material that will deteriorate or blowout faster than others.

oldtimer · « **Reply #7 on:** June 08, 2007, 07:15:18 AM »

I visit Auto Zone often since a buddy manage one and he mentioned the cherry bomb. I really don't rev up my car the high, so if it will help at a lower rpm range I think the cherry bomb might be my best bet for now. don't have to wait for it and I can weld it on and drive the car again.

bmwman91 · « **Reply #8 on:** June 08, 2007, 12:26:31 PM »

With no cat, the car will be really loud no matter what? I suppose that a resonator and decent muffler could help, but it will probably still be really raspy with no cat. Did removing it hurt the low-end at all? On my first M42, just going to a high-flow cat mad the car super raspy, with a full Supersprint cat-back after it (which is a pretty quiet cat-back). Best of luck!

sumyungguy · « **Reply #9 on:** June 08, 2007, 01:26:58 PM »

Quote from: D. Clay;27376

Go to a cheap independent muffler shop and have a universal welded in. They have them in different pipe sizes. I got one for $75 installed.

Did the same here..

Alpine003 · « **Reply #10 on:** June 08, 2007, 07:06:44 PM »

Quote from: bmwman91;27404

With no cat, the car will be really loud no matter what? I suppose that a resonator and decent muffler could help, but it will probably still be really raspy with no cat.

I've found this to be true if the rear muffler section is a straight thru style. I believe the op said he got a performance Dynomax. I assumed this was the chambered version. If it is a straight thru version then even with a resonator, he could still experience some raspiness in the upper revs.

Shocker · « **Reply #11 on:** June 08, 2007, 07:20:48 PM »

Has anyone tried a Flowmaster chambered muffler VS. the Magnaflow straight through design? Just wondering if the flowmaster muffler takes out the rasp. :confused:

jpod999 · « **Reply #12 on:** June 09, 2007, 12:21:56 AM »

Quote from: Alpine003;27426

I've found this to be true if the rear muffler section is a straight thru style. I believe the op said he got a performance Dynomax. I assumed this was the chambered version. If it is a straight thru version then even with a resonator, he could still experience some raspiness in the upper revs.

I think he said he swapped out the Dynomax for a Magnaflow, but is still not happy with the sound.

oldtimer · « **Reply #13 on:** June 12, 2007, 05:58:25 PM »

For the low end after eliminating both the cat and the resonator. It definitely affected the low end. So I am re-thinking my approach here. I got new pipe, high flow cat and resonator. After fathers day week end a buddy who owns a Trans. shop is going to let me use one of his lift to re-configure my exhaust.

bmuser · « **Reply #14 on:** August 02, 2007, 02:57:44 PM »

so wait, do people use these long resonator tubes instead of mufflers? or do you guys put them right after teh cat, and then a little pipe and into a muffler? Is there room for a 24" tube? Im looking to quiet down my exhaust as well.