question about resonators

[jmv]

okay so basically i'm just looking to find out what exactly a resonator does for the exhuast. Right now i'm dumped after my midpipe, and i'm considering getting a custom exhuast made just running to the back with no muffler and a tip something like this:

http://www.autoanything.com/exhausts-mufflers/65A2440A0A0.aspx

what effect would a resonator have on a setup like that??

 

[Lodivigo]

Anykind of resonator will likely quiet the system or at the very least change the exhaust note. I'm running the stock system with no muffler and it's a little louder than stock but definitly quieter than an open exhaust (no cats). When I do get rid of the cats I'm probably going to have to put a muffler back in the system or at least a resonator.

 

[jmv]

i've got a high flow cat.... to me its not really noticeably quieter than my friend who ran open midpipe with a 3" catless midpipe.

 

[hotrodf1]

I believe a true resonator (no fiberglass packing inside) will cancel a narrow band of frequency - the stock resonator is probably tuned to whatever frequency the inside of the car naturally amplifies to try to reduce any sort of drone at highway speeds. If you take the stock resonator off, it probably won't be much louder most of the time, but you'd find a narrow RPM band where the sound would kind of "ring" in the car. This type of resonator won't do much if anything on a dumped open exhaust, especially beneath the body of the car, which will absolutely amplify everything using the sheet metal like a drum.


There are some fiberglass packed "resonators" that are really more like bullet mufflers - think Borla, Flowmaster bullet style, etc. A wide open glass pack style muffler, with minimal packing, that will reduce sound some but not sacrifice any flow.

 

[hotrodf1]

i've got a high flow cat.... to me its not really noticeably quieter than my friend who ran open midpipe with a 3" catless midpipe.

A high flow cat will inherently have more open area for the exhaust to pass through, also letting more of the sound go through as well. A regular "restrictive" cat will reflect more sound back up the pipe as there is less chance for it to pass through (less open area).

 

[cmahlig]

thats a good idea jason, go get a quote on how much it would cost to just mandrel bend some piping to the back