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Old 01-31-2003, 03:33 AM   #1
Kostamojen
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Exclamation The secrets of the WRX muffler REVEALED! (Including why it squeaks on N/A cars)

This is all thanks to DDMan and his adventures with mufflers... He had spare time, and a spare stock WRX muffler to cut open, so he did

Anyway, he was astounded by what he saw, so I came and looked. As many of you know, I have a WRX muffler custom fit to my L so I was curious to see what it was doing. Amazingly, I dont know what its doing! Look at this thing, its a mess!!!

http://community.webshots.com/photo/...62257431ojVqil

What caught my attention the most, as it will anyone else who has that annoying muffler squeak on their cars with WRX mufflers when they turn the car on/off, is the obvious HOLE in one of the muffler walls that is ironically very simular to the types of hole thingies that people are putting into their mufflers to make whistle mufflers! Check it out:

http://community.webshots.com/photo/...62257468IzbFTz

Another interesting thing you may not know is that the TIPS on the WRX muffler are removable! Just loosen that nut and yank the sucker off

Anyway, I found this to be very informative and I thought some of you guys might like to see for yourself... Maybe even the folks on the other forums would like to see too, I dont know.

I do know that I have no doubt the straight pipe muffler i'm having made for autocross will give me some sort of gains after seeing the insides of my muffler in person... sheesh. Although that 2" pipe with a WRX muffler tip attached at the end will look a little funny
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Old 01-31-2003, 09:46 AM   #2
RaceCarRiot
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WOOOOoooooOOOO WOOOOOooooOOOOO!!!
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Old 01-31-2003, 02:08 PM   #3
schnell
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Are you certain that that hole makes the whistle? I remember a post a while back where the guy took off the tips, and the whistle went away. He believed that it was the design of the tips, not anything internal.

While the internals do look weird, I have nothing to compare it to. Does anyone with muffler design knowledge have any input. Might be a brilliant design for all I know.

schnell.
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Old 01-31-2003, 02:13 PM   #4
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THose internals look similar to o lot of aftermarket mufflers like the Dynomax (I think)

Good info dude. THanks

Eric
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Old 01-31-2003, 02:24 PM   #5
Swano
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It's nice to see the inside of it.

By the way got one on my MY02 TS with a custom midpipe and I love the sound of it.

Not quite WooooOOO WooooooOOOO, not like a whistle muffler at all!

Phil =)
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Old 01-31-2003, 03:43 PM   #6
DDMan
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I dunno, I only have heard the whistle when someone shuts the car off...but it makes sense that's what is causing the whistle.

Went through enough dremel bits to do it, but now I know what I need to do to either modify the muffler to fit on my car or modify my exhaust to fit to the muffler.

Hmmmm. Anyone wanna donate a RS/TS/L muffler to the chopping block to see what its internals look like?
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Old 01-31-2003, 10:21 PM   #7
Kevin Thomas
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Thumbs up Hrrmm

Quote:
Originally posted by Eric v2.0
THose internals look similar to o lot of aftermarket mufflers like the Dynomax (I think)

Good info dude. THanks

Eric
Hello Eric,

Here's a pic of the internals of a Dynomax Ultra Flow SS muffler I use on my XT6.



I couldn't post a pic of the Super Turbo Dynomax muffler.
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Old 01-31-2003, 11:00 PM   #8
Eric SS
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swap and N20. gone. : (

Default Re: Hrrmm

Quote:
Originally posted by Kevin Thomas


Hello Eric,

Here's a pic of the internals of a Dynomax Ultra Flow SS muffler I use on my XT6.



I couldn't post a pic of the Super Turbo Dynomax muffler.
Well I guess it wasn't the inside of the Dynomax then I know it is some muffler though. I just can't think of it.

Eric
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Old 01-31-2003, 11:36 PM   #9
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Dudes,,, you need to read this
http://www.wrx.org.au/tech/000213/Ex...Comparison.pdf

Im looking for the most quiet muffler with the best flow characteristics, the magnaflow looks nice but is it loud?
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Old 02-01-2003, 12:46 AM   #10
DDMan
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I actually have a Magnaflow muffler, and I dont think its too loud (nor does Kosta). In fact, I'v heard people say its about as loud as the STI muffler. I would recommend Magnaflow to anyone.
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Old 02-01-2003, 01:19 AM   #11
jasona
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Quote:
Originally posted by DDMan
I dunno, I only have heard the whistle when someone shuts the car off...but it makes sense that's what is causing the whistle.

Went through enough dremel bits to do it, but now I know what I need to do to either modify the muffler to fit on my car or modify my exhaust to fit to the muffler.

Hmmmm. Anyone wanna donate a RS/TS/L muffler to the chopping block to see what its internals look like?
if i get bored, i'll cut open my ts muffler and take pics.

the muffler on my car is just a tube with fiberglass packed around it, like that dynamax but no slant in it, and the muffler itself is round. its basically just a straight pipe with a resonator around it.
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Old 02-01-2003, 02:21 AM   #12
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Quote:
Originally posted by DDMan
I actually have a Magnaflow muffler, and I dont think its too loud (nor does Kosta). In fact, I'v heard people say its about as loud as the STI muffler. I would recommend Magnaflow to anyone.
Note: The magnaflow muffler DDman has looks identicle to that dynomax muffler pictured inside, albiet I dont know if it has that fiberglass stuff. Flow is excellent, sound is excellent, I would get one for an N/A Impreza OR a WRX.
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Old 02-01-2003, 02:36 AM   #13
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Default Re: The secrets of the WRX muffler REVEALED! (Including why it squeaks on N/A cars)

Quote:
Originally posted by Kostamojen
This is all thanks to DDMan and his adventures with mufflers... He had spare time, and a spare stock WRX muffler to cut open, so he did
DDMan you bastard!!!! I had my friend truck that muffler up to you in Sac...and you cut it open?!!?!?!

That's the last time I help YOU out! At least give credit where credit is due!

Hmmm I wanna go cut open my Prodrive!

-=Eric
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Old 02-01-2003, 03:16 AM   #14
DDMan
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Hey...it was Steve's post not mine...

The muffler has been sittin in my garage for like 4-5 mos. now, and ironically Steve is doing the EXACT same thing you did. So I cut the pipe off Steves muffler (he kept the pipe, I got that muffler with an extra 1" of pipe stuck to the back of it)

I woulda torn that one apart...but the one I cut had that little bit more pipe.

Just think of it as a donation to Scooby Science!


***** NOW EVERYONE, THANK MEXICANPIZZA FOR HIS DONATION *****
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Old 02-01-2003, 03:17 AM   #15
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Quote:
Originally posted by DDMan

***** NOW EVERYONE, THANK MEXICANPIZZA FOR HIS DONATION *****
<bows>

I'd like to thank my mom...and my wife for cosigning my WRX loan...and um...Subaru.
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Old 02-01-2003, 04:38 AM   #16
SR-71WRX
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"DDMAN" and anyone else with an aftermarket standalone muffler (what else do you call a muffler like magnaflow?)......

Is the muffler your only modded peice of the exhaust? I ask because I'm getting an HKS DP and custom 3" tubing made to mate from the DP to the muffler...... my dilemna is that I now need a muffler and PERSONALLY I don't see the point in spending 300-$500 for a muffler. Thanks!

BTW.... seeing that cut open stock muffler really makes me want to get something else!

--ROB
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Old 02-01-2003, 11:21 AM   #17
danci1973
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Why would that hole squeal or whistle only on N/A cars? Shuting down a turbo engine is not that much different from the muffler's point of view. I guess...

D.
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Old 02-01-2003, 02:00 PM   #18
spiralsmurf
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hey ddman which magnaflow do you have? i'm selling my stromung because i want something more docile where i can hear my engine, but i don't want a drone when i'm cruising on the freeway.
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Old 02-01-2003, 09:51 PM   #19
DDMan
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Ok...for everyone who is asking now heres my exhaust setup:

-Borla Headers (V4)
-Stock Cats
-Custom (non-mandrel) 2.25" midpipe with resonator built in. (Straight-through resonator and pipe goes up to right behind muffler)
-Polished SS Magnaflow Muffler. 4"x9", 2.25" diameter pipe, and an offset/center design...Yes, you really can look straight through this muffler.

For those who dont want a "droning" sound, I would suggest getting a resonator built into the midpipe, plus it quiets the car just a little more.
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Old 02-01-2003, 10:13 PM   #20
spiralsmurf
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and its not loud?
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Old 02-02-2003, 01:23 AM   #21
Kostamojen
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Quote:
Originally posted by danci1973
Why would that hole squeal or whistle only on N/A cars? Shuting down a turbo engine is not that much different from the muffler's point of view. I guess...

D.
I dont know, perhaps the turbo negates the pulsation of the engine in the exhaust, or perhaps its because of the WRX midpipe... I dont know, but it does it. However, I have heard a couple WRX folks have the problem...
Quote:
Originally posted by spiralsmurf
and its not loud?
Nope. Just a stromung cat-back is like super loud in compairison. Its quieter than just about any N/A Subaru ive heard, even mine with a WRX muffler If it didnt have a flex joint type resonator, it might be louder though. But its definatly my favorite sounding subie so far.
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Old 02-02-2003, 04:28 AM   #22
spiralsmurf
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hmm. how much does that muffler go for? i think i'll get one instead of my stromung.
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Old 02-02-2003, 04:43 AM   #23
Kostamojen
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The magnaflow? The box is like $70-90 or so at muffler shops, and as with any universal muffler you can get any tip you want... The one that N/A subaru's need is generally the 2.25" with an offset/center style box due to the location of our piping.
http://www.magnaflow.com/03cat-back/...aluminized.htm
(Note: dont order it online, just get it from a local shop that has it hanging on the wall)
I asked today about a 2.5" one with just the muffler installed, and they said about $130 installed. With a midpipe, probably around $200
Make sure to get a resonator flex pipe thingy in the midpipe too.
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Old 02-02-2003, 04:43 PM   #24
DDMan
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Say WHAT? Not a flex pipe thing...just a resonator. The resonator I have looks just like a glasspack, but is only about 6" long (and not red).

Quote:
Originally posted by Kostamojen

Make sure to get a resonator flex pipe thingy in the midpipe too.
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Old 02-02-2003, 05:03 PM   #25
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cool
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