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1956 chevy 210 del rey sedan
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you have what is to be expected with spintech , flowmaster and mufflers like that if you don't want drone you need a turbomuffler, borla,edelbrock magnaflow etc.
 

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Had a terrible drone in my hotrod Buick with Smitthy mufflers .I wrapped entire system with wrap all the way back to where they go over the rear end . Almost gone. Just have it while in town around 20 MPH.
 

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I've got spintech's with a 383, no x or h pipe.. no drone, unless I set the idle to 1000 rpm. I have it set at 800. I will say this, they are LOUD as soon as you get on them. I love the sound but it gets a little old after a while.

I will say your mufflers seem to be a bit further back than mine. What size exhaust? timing and idle?
-bg8
 

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Have you considered resonators?

Have you considered putting resonators in your tailpipes? I know it's very tight back there by the leaf springs, but I have seen some pretty skinny ones. I run resonators on one of my other cars, and it is quiet as a normal car, and still runs 11.70's through the exhaust. Guys at the track used to always shake their heads in disbelief at how quiet my car was doing a burnout, while still running deep in the 11's. No interior drone at all with resonators.

Driver.
 

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Discussion Starter · #13 ·
I've got spintech's with a 383, no x or h pipe.. no drone, unless I set the idle to 1000 rpm. I have it set at 800. I will say this, they are LOUD as soon as you get on them. I love the sound but it gets a little old after a while.

I will say your mufflers seem to be a bit further back than mine. What size exhaust? timing and idle?
-bg8
im running 2 1/2 pipe. Not sure on the timing. Im idling at at 700 rpms
 

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Resonators

Driver, what brand or model of resonator are you running? I'd sure like to quiet my exhaust down some while at cruising speed.
I am running some old Dynomax resonators that I installed in 1994. Unfortunately they are on a 65 Chevelle that is tubbed, so I have lots of room behind the tires. They are oval shaped, like a small turbo muffler, so these same ones would not fit a stock trifive. However, even something as skinny as a glasspack would knock down a lot of resonance. Some late model Suburbans use a very narrow resonator, so that may be a good place to start.

Driver.
 

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Sound of engine with resonators

A thread like this is very hard to do justice without sound. Here is a video of what my Chevelle sounds like under load.

http://youtu.be/3i8rnERofRA

Very smooth going down the highway, no "Rappp" under accel or decel, and all you hear is engine when really bashing on it. The resonators and exhaust do not slow the car down measurably. Difference from open exhaust compared to running through the exhaust is .02 to .03 measured over about half a dozen runs, and the difference is so small as to be difficult to even measure.

Driver.
 

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Not sure by the photo where the exhaust exits. But if the tips are facing down, you can get a drone when the exhaust hits the pavement. Exiting straight out will help some.

The other thing you can do is increase your sound deadening material in the location of the mufflers. That will help.
 

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