My custom Magnaflow exhaust

[Squeeze]

This week I had a very reputable local shop install a "resonator-back" exhaust system. I had them leave the stock resonator because I wanted as quiet as possible aftermarket sound, if that makes any sense. I'm 32 and have 2 smaller kids so I don't need to be the "loud car guy". In my opinion it looks awesome! I had them install 2 Magnaflow stainless small square tips at an angle coming out under the 3dCarbon rear valence. Sound? Sounds great from the outside, but drones horribly inside. Thats where the fun ends. I can't stand the sound inside the car, I know its an economy car, and there probably isn't a ton of sound dampening material, but holy cow! I can't even talk on the phone! So, I went back and told them I'm not happy and the guy wants to try an 18" Magnaflow muffler, it has a 14" on it now. I get that done next Tuesday, so I'll report back then, but I'm pretty certain the stock exhaust is going back on. I'll leave the 2.25" stainless res-back piping but have them weld the stock can back on if possible. Here's some dirty pics.








Anyone else have a droning issue with their aftermarket exhaust?

[Rosco]

I had a 2000 Contour SVT and had the center resonator switched out to a flowmaster one and got some bad drone... it is hard to deal with for sure... I would think that the longer muffler will hopefully help... Good luck

[JSR84]

My last car had bad droning issues. I was able to solve them with the use of a J pipe. Basically the J pipe welds on to the exhaust before the muffler and cancels out the frequency causing the drone. The higher the drone the shorter the J needs to be.

It looks something like this with the end capped off.


I made mine adjustable at the end so I could fine tune it.

I'll see if I can dig up the formula.

[supergee]

I believe the technical term for the "J pipe" is a Helmholtz Resonator. Theres a guy who makes custom mufflers for 4Runners, among other vehicles, and he uses a similar design that makes his mufflers zero drone.

Helmholtz resonance - Wikipedia, the free encyclopedia

[Squeeze]

I don't know how easy that would be, there isn't a whole lot of room under there...

[443534]

Your exhaust is literally falling and dumping out the back...

Should went with a single oulet.

The setup I had on my car would have been what your looking for.

http://fiestafaction.com/forums/fies...my-fiesta.html

Trust me, better sound than a dual out.

It will be in half.

[BondiBlue]

You hatch guys don't have much room after the can do you? The sedans have a good foot of pipe/tip after the factory muffler location.

On topic, mine drones like a b*tch while on the throttle. I wanted it loud, so I'm cool with it.

[JSR84]

I don't think single our dual outlet has anything to do with it; however, having the tips angled down like that could also be causing the issues. It could be causing the sound waves to deflect back into the car. I know you can get drone with rolled tips as well.

[443534]

Originally Posted by JSR84

I don't think single our dual outlet has anything to do with it

Oh yes it does.

Especially with tips.

It gives more room for exspansion...


Does the OP know what the inlet/outlet sizes are of the droning muffler?

Wanna bet its 2-1/4" in/Dual 2-1/2" out?

That will drone.

He needs a 2-1/4inlet / 2" dual outlet.

Loose the tips, and you'll lose noise too.

[aspitaletto]

a Very large part of the drone comes from the use of thin wall exhaust piping.

The 14" dual tip muffler will also make it quite loud, go for a single outlet chambered muffler and it will quiet things down pretty good

exhaust tips dont do crap for sound, well if they are several feel long then they do,