Pre-muffler

[TwinCam]

This is strictly a guess...hopefully a good one. My question is if one removes the premuffler from the exhaust system, straight pipes that section, will you get a better "thump, thump" from your exhaust that's exiting? It is not a emissions device, so I doubt it will harm anything. Any take on this?

[JimW]

Hrm do you mean the resonator?

[TwinCam]

I would guess.....Most manuals call them pre-mufflers. It's just aft of the converter.

[JimW]

Ya, ok, just wanted to make sure we were on the same page here. I only quiets down the system, I doubt it does anything for emissions.

My cat back exhaust still has the resonator, and I wouldnt want to take it off. Its only meant to lower volume.

[Marc]

The resonator is a straight through design. You might
get more noise, but I doubt if there'd be much of a
difference in back pressure.


________________

GM!!! BRING BACK OLDS!!!

[SupaStealth]

I took my resonator off with my cat-back, and its actually still pretty. it doesn't backfire or anything

[kobalt]

The purpose of a resonator in an exhaust system is to resonate opposite of "undesirable" exhaust sound frequencies effectively cancelling them out. Undesirable sounds such as popping, pinging and rasp can occur without a resonator installed, but are more common in smaller displacement engines. Is any rasp or popping evident in Auroras with the resonator deleted? Resonators do cause slight turbulence of exhaust gasses, and removing one should net ~5hp in the top end.

[SupaStealth]

i haven't noticed any rasping or popping that i can hear, then again i haven't heard my car outside of it, i try to get my more responsible friends to take her around the block but they're too afraid because its "too nice of a car", lol.

[JimW]

If you've seen my recently posted vid, it gives a good idea of a modded exhaust with a res.

[kobalt]

Your car sounds awesome to me Jim - I had no idea you removed the resonator.

[JimW]

I apologize, perhaps my writing was vague. My exhaust system still has the stock resonator.

I wont be removing it.

[TwinCam]

Thanks everyone...ya'll have been very helpful.

[kobalt]

Jim - it is I who should apologize. Your writing was perfectly clear - I must have read "with" but thought it said "without". Because of this I thought to myself that you were "pulling my chain" for the lack of better expression: I thought "no resonator and ZERO rasp? something's not right..." - silly me

[SupaStealth]

well, as i said, i don't have a resonator, and i can't hear any rasping coming from my exhaust. i suppose i'll have to finally get a sound byte of my exhaust so you all can listen .

[Aurora40]

The resonator is pretty straight-through. My OEM one had a bit of an insert thing in it, while my CORSA one was the full width and straight-through.

But it isn't really a restriction, and it prevents resonance, hence the name. Resonance is most noteable at lower rpms, around 1500-2500, especially while cruising. If you took yours out and don't notice any resonance, be glad. I wouldn't take mine out, though, as cruising resonance is about the most annoying thing on earth while driving. I wouldn't run the risk of it since the payoff is so small. Just my two cents.