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Old 01-22-2007, 12:43 AM   #1
TDIpowered
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Default Exhaust question

I am looking into getting a custom cat back system made for me at the local shop (ive heard good things from a friend with a Porsche 944) and i was wondering what mufflers sound best on the 2.5 engine? I dont want it to sound ricey. I want a nice, deep exhaust note...not ridiculous... thanks for the help.
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Old 01-22-2007, 01:42 AM   #2
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You really won't get a ricey sound out of the boxer engine, honestly.

I went with a slightly used 06 STi catback...not too loud, deep sounding, and a bit more power, I'm happy with it.
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Old 01-22-2007, 04:20 AM   #3
that one legacy
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just be sure that you stick with 2.25" piping, it seems to be the best size for the NA subies.

as far as the "ricey sound", with the boxer engine, you really only get that by running equal-length headers. the short explanation is that equal-length headers screw with the natural forces of the world, combining to form DESTRUCTOR! VILE SCOURGE OF EVERYTHING GREEN AN LIVIN....

oh wait sorry about that.

seriously, equal-length headers do seem to give a bit more punch in the power department, but they completely kill the "boxer rumble" which is what makes owning a subaru so worthwhile. as long as you don't slap a glass pack on your car (which is a crime punishable by death around these here parts), keep your piping diameter right, and make sure that the muffler shop doesn't "treat" you to a nice series of 90 degree crush bends, you'll be just fine.

for what it's worth, i run a OBX universal muffler with custom 2.25" piping. i have mine angled because it helps to keep the piping as straight as possible, but you can really do it any way that you like.
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Old 01-22-2007, 10:30 AM   #4
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I went with a STi muffler also and am very happy with it. Great mellow sound.

I am unsure about your year but most if not all subbies have a flange right at the rear axle so changing mufflers is fairly easy. That way you can keep the midpipe intact.

Peace,

Greg
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Old 01-22-2007, 06:52 PM   #5
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For those that suggested the STi muffler:

http://forums.nasioc.com/forums/show...ht=sti+muffler

Big ol' thread, there's a couple of sound clips there too.

As far as aftermarket mufflers...that's hard to say, no one seems to have tried any other brands around here. You can try a 50 series flowmaster (quieter, less trying to sound like a V8 than the 40 series), those seem to be good for large displacement 4 cylinders (yes 2.5l is large...for a 4banger ). Or a turbo muffler. I wouldn't really go with a straight thru muffler like a Dynomax Ultraflo or something like that; you'll be making way more sound than any actual power
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Old 01-22-2007, 07:30 PM   #6
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Quote:
Originally Posted by that one legacy View Post
as long as you don't slap a glass pack on your car (which is a crime punishable by death around these here parts)...

for what it's worth, i run a OBX universal muffler with custom 2.25" piping.
Uhhh.... aren't all OBX's glass packs?

Quote:
Originally Posted by rougeben83 View Post
You can try a 50 series flowmaster (quieter, less trying to sound like a V8 than the 40 series), those seem to be good for large displacement 4 cylinders (yes 2.5l is large...for a 4banger ). Or a turbo muffler. I wouldn't really go with a straight thru muffler like a Dynomax Ultraflo or something like that; you'll be making way more sound than any actual power
Don't do a flow master! They sound like poo on subarus.
http://www.youtube.com/watch?v=2SUx3AYqJIs

I bought a hooker aerochamber and will be installing soon. It's supposed to be a pretty quiet muffler without packing material but chambers and resonators instead. Every sound clip of other cars with it has sounded awesome, this one being the closest to a subie sound as I can find:
http://www.youtube.com/watch?v=Jd6VjVlX184

My friend brought his welder up, we're just waiting for the snow to clear or find a friend with a garage. Then I'll have a sound clip. Here's some pics to show even with its staggered chambers it's pretty straight through:
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Old 01-22-2007, 08:12 PM   #7
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Quote:
Originally Posted by Plays_With_toys View Post
Uhhh.... aren't all OBX's glass packs?



Don't do a flow master! They sound like poo on subarus.
http://www.youtube.com/watch?v=2SUx3AYqJIs

I bought a hooker aerochamber and will be installing soon. It's supposed to be a pretty quiet muffler without packing material but chambers and resonators instead. Every sound clip of other cars with it has sounded awesome, this one being the closest to a subie sound as I can find:
http://www.youtube.com/watch?v=Jd6VjVlX184

My friend brought his welder up, we're just waiting for the snow to clear or find a friend with a garage. Then I'll have a sound clip. Here's some pics to show even with its staggered chambers it's pretty straight through:
Yeah, that sounds like a 40 series...the 50- and 60 series are quieter since they add more baffles...

That aero muffler looks nice, but I think it'll sound like a 40-flowmaster too - it's construction is extremely similar
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Old 01-22-2007, 08:37 PM   #8
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Quote:
Originally Posted by rougeben83 View Post
That aero muffler looks nice, but I think it'll sound like a 40-flowmaster too - it's construction is extremely similar
Don't say such awful things!! I'm gonna test it first with a test pipe before welding it on. I still have the receipt and can return it if need be...

I don't think they are that similar... Maybe the principles employed are similar though...

Aero:
http://www.holley.com/data/types/pic...eroChamber.jpg
Flowmaster 40:
http://www.racerpartswholesale.com/images/40ser.gif

Last edited by Plays_With_toys; 01-22-2007 at 08:44 PM.
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Old 01-22-2007, 10:42 PM   #9
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Quote:
Originally Posted by Plays_With_toys View Post
Uhhh.... aren't all OBX's glass packs?

not as far as i know, but i've never taken one apart so i can't be certain.
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Old 01-23-2007, 02:02 PM   #10
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Quote:
Originally Posted by Plays_With_toys View Post
My friend brought his welder up, we're just waiting for the snow to clear or find a friend with a garage. Then I'll have a sound clip. Here's some pics to show even with its staggered chambers it's pretty straight through:
The Aerochambers are quiet. On my gf's 92 Camaro 5.7L V8 with headers, stock cat, and 3" cat-back it is pretty quiet. But has a nice rumble to it. I'd imagine that will sound good on a Subbie, post up a clip
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Old 01-23-2007, 02:17 PM   #11
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I have a dynomax super turbo muffler on my car, 2.25" from catback, no resonator. IMO sounds really good, quiet just idling but getting on it has nice, fairly deep rumble.
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Old 01-24-2007, 10:32 AM   #12
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I'm getting ready to do a cat back as well. I was looking at the SPT axle back which has a wagon specific fitment and a stromung mid-pipe.

Anyone have any experience with this muffler?

http://www.renickmotorsports.com/osc...oducts_id=1160
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Old 01-24-2007, 11:36 AM   #13
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Don't have any experience but you do you really want to have your tail pipe round down towards the ground like that?
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Old 01-24-2007, 12:50 PM   #14
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yuck, I thought that was just a crappy pic, but if it's curved like that, then forget it, it'll look silly. Are they really like that?

OK, here's two other suggestions:

Stromung - $409, but will the tip be long enough for the wagon?
boxer4racing.com

OR

Borla - Wagon specific - $450
http://www.spomotorsports.com/Catego...stomerID=57210
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Old 01-24-2007, 06:26 PM   #15
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Well the SPT's for sedans don't have the downturn. That'd be really lazy of subaru to down turn the pipes for the wagon instead of extending them a little. I know that Reason has his SPT axle back for a sedan up for sale for cheaper than you can buy new. Maybe you can use what you save to have an exhaust shop extend the tip for your wagon.

Stromung wouldn't be long enough. They are perfect for imprezas, but imprezas have a shorter distance between the edge of the bumper and the metal beam holding it on.
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Old 01-24-2007, 07:33 PM   #16
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Only SPT axlebacks that are turned down are the BE/BH ones because that's how the stock setup is like.

If yours doesn't have a turndown, odds are that pic is just a stock image and not the actual muffler.

Oh yeah, look at that pic, that's not the muffler for a BD/BG. That's for 00-04; the hangers are a good tell-tale sign.
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Old 01-24-2007, 09:07 PM   #17
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Ah good call. That is indeed a BE/BH muffler. Then I am sure as long as you get a BK/BG muffler you'll have a nice tip and it'll sound good too.
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Old 01-24-2007, 09:54 PM   #18
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when you order the stromung you just tell them it is for a wagon, and it will also be long enough...

Jared
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Old 01-25-2007, 07:29 PM   #19
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Sweet. Thanks guys.

So I think it's down to the Stromung or SPT

Anyone have opinions which way to go?

Stromung is more $$$ - does is have a performance / sound / look advantage?
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Old 01-25-2007, 08:56 PM   #20
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Borla knockoff headers, 2.5 mandrel catback resonated, STi muffler

http://s87.photobucket.com/albums/k1..._20h15m35s.flv
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