: what resonator reduces drone, but not volume? (corsa not option)



mtflight
12-11-08, 04:20 PM
The 1 million dollar question: what can I put in there that will reduce drone, but not significantly reduce sound output? What is inside the stock resonator? is it a straight through design or is it a maze of chambers?

(hint: Corsa is too much money; therefore, not an option)


Here's the full story....

I had a 98 ETC and replaced the stock mufflers with Flowmaster Delta 50s. This particular model has a Helmholtz sound/resonance reduction chamber, in addition to the delta design that give it the nice sound and lessened backpressure, without noticeable drone or high volume in the cabin. Sure enough, they weren't very loud at idle but had a slightly mean edge to them... and they sounded nice when opened up. Big difference from stock. This is basically what it sounded like on the outside:

GehWVg8v-IM

Below is an image from the Walker catalog...

http://www.walkerexhaust.com/images/coupons/0245.gif

Fast forward to my current car, a 2003 DHS. So I purchased the same mufflers as I had on the ETC, knowing the tonal quality was going to be different because the pipe from the cat-back to the exhaust was less in diameter. I was there during the install, everything went great... except... when I powered her up--couldn't hear it. Just as quiet if not maybe only 25% louder. Disappointing!

http://www.walkerexhaust.com/images/coupons/0230.gif



The only difference I can see, from looking at the Walker charts, is the lack of a resonator on the ETC. So I am now looking for a resonator replacement. (The 98 did have a tiny pinch of drone--not really noticeable unless you looked for it, though.)

My options (round exhaust to replace giant resonator):



Flowmaster "Outlaw" (a non glass-pack, only rings welded inside) http://www.flowmastermufflers.com/outlaw.html
Magnaflow straight-through muffler http://www.magnaflow.com/02product/universalsatinr.asp?shape=round
Glass-pack generic, or cherry-bomb (I'm keeping the Flowmasters... but I'd use one of these to replace the resonator, in hopes of eliminating drone without sacrificing much sound volume).
rEX9rBOgIBo

I like the idea of something without fiberglass packing so that the sound does not change over time--steel mesh would be great, but budget is a concern. I've already spent $280. I'd like to spend ~$100 including the muffler and install.

Look forward to some nice thoughtful replies! I posted this in the Deville section too. Due to the exhaust similarities I wish Seville owners could read it hence my post here for the knowledgeable/experienced.

GizmoQ
12-12-08, 02:54 AM
The 1 million dollar question: what can I put in there that will reduce drone, but not significantly reduce sound output? What is inside the stock resonator? is it a straight through design or is it a maze of chambers?

(hint: Corsa is too much money; therefore, not an option)

First of all Corsa is not out of the question. These Corsas (http://cgi.ebay.com/Corsa-8332443-Black-dB-Muffler-JEGS_W0QQitemZ400016712685QQcmdZViewItemQQptZOther _Vehicle_Parts?_trksid=p3286.m20.l1116) are on my ESC-V. I replaced my resonator with a straight pipe and they sound wonderful; perfect fit (a little welding to attach hangers, but almost exact same dimensions), no drone, and mean WOT!


I had a 98 ETC and replaced the stock mufflers with Flowmaster Delta 50s.

Big Drone.


Fast forward to my current car, a 2003 DHS. So I purchased the same mufflers as I had on the ETC, knowing the tonal quality was going to be different because the pipe from the cat-back to the exhaust was less in diameter. I was there during the install, everything went great... except... when I powered her up--couldn't hear it. Just as quiet if not maybe only 25% louder. Disappointing!

I like the idea of something without fiberglass packing so that the sound does not change over time--steel mesh would be great, but budget is a concern. I've already spent $280. I'd like to spend ~$100 including the muffler and install.

Look forward to some nice thoughtful replies! I posted this in the Deville section too. Due to the exhaust similarities I wish Seville owners could read it hence my post here for the knowledgeable/experienced.


The problem is I think your budget is unrealistic. I've seen the Corsas as low as $140 each and my install was $150 on top of the mufflers and Tips. You're talking two new mufflers and install for less than $100 - I don't think so (and if so I wouldn't trust it to last long). If you talking just the resonator, and you say the Deville has a smaller diameter exhaust than your other Caddy, I'd say replace it with a straight pipe like I did. The increase in cabin volume from the exhaust is negligible compared to the FlowMasters.

Good luck.

urbanski
12-12-08, 06:54 AM
http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/156501-resonator-replacement-reduces-drone-not-volume.html