Some muffler questions.

[SilentRacer]

I was thinking about getting a universal muffler so some quick questions.

1) 2.25 inlet is the stock size right?
2) The difference between axleback and just muffler is muffler has to be welded on and axeleback is bolt on? (besides the hangers I mean) ?
3) Does muffler shape matter?

tks

[Perdue]

1. I think the stock pipe size is 1.5 or 1.75...somewhere there abouts.

2. An axleback is a bolt up procedure. It will bolt onto the back of the midpipe with the resonator, somewhere around the rear axle. They'll also have the appropriate hangers already on them. This is if the axleback is made to fit your car.

A muffler is pretty much a universal install...if you just want the muffler replaced, a shop can cut off the old muffler and weld up the new one in it's place. They'll also need to put up hangers on the muffler.

3. I'm guessing the shape of the muffler is going to be decided on what kind of looks you want. If it's too long, it won't fit, but IIRC, I had plenty of room behind my universal borla turbo muffler with tip, and it was 11 3/4" long in the case.

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If it were me, I'd get a new flange and have an exhaust shop custom make an axleback for the car with a universal muffler of your choice. That way, when you want to return to stock, you can just take the aftermaket muffer off and put the stock muffler back on. It's much easier to do so than to have to deal with a hacked up exhaust later on...trust me.

Hope this helps.

[SilentRacer]

Cobb 3in from an STI, will this fit?
http://i27.photobucket.com/albums/c152/EVILSTI/exhaust005.jpg

[Wiscon_Mark]

With some modification (reweld hangers, change flange) yes, it will.

Axleback is everything from the axle, back, simply. A muffler is just the sound deadening canister, the axleback includes piping from the midpipe flange, the muffler, and the tip.

You'd find it hard to get a big enough muffler that it wouldn't physically fit underneath the car, the stock Legacy muffler is huge.

1 7/8ths is the stock piping size. 2.25" is what we normally recommend for performance N/A applications, you tend to lose a bit of torque with 2.5"

[Plays_with_Toys]

There's going to be new hangers for sure. The BE has different bend and different hangers than the other legacies. Plus it's 3 inch. Even if its just the muffler you'd probably notice alot less torque.

[Huffer]

You might as well go custom midpipe to match your existing cats & that way you can use any axle-back designed for a [insert model subaru here].

I have a midpipe made up that "converts" my center section to fit any WRX/STi axleback, with hanger modification obviously.

[subaru_terrence]

let me bump this old thread up :P

silentracer...so did you end up make a new custom axleback for the cobb 3" muffler?


I just bought a 3" cobb muffler from NASIOC for a really good deal too...but I can still refund it in a day or 2 since the payment didnt transfer yet.

Here is my question, if you did install, is it really loud?

I know NA cars should have any inlet bigger than 2.5" but is it a really BIG problem if I make a new custom axleback for this cobb 3" inlet muffler and leave my midpipe and the rest of the parts stock?

Is the loss of torque noticeable?

[SilentRacer]

I never got a cobb, went instead with the only Blitzen I ever seen. Its a direct bolt on , stock size piping. Above 3k rpm it roars but under that its quiet like stock STI. Just remember with any muffler with a tip, the BE has no cutout for it so it will melt the bottom of the bumper.
http://i2.photobucket.com/albums/y40/rageingspirit/mufflertip.jpg

[subaru_terrence]

this is my current setup with wrx muffler... I think it looks kinda weird since the muffler is way below the bumper....this time I will tell the muffler shop to weld it a bit higher if possible

https://sl-i.net/FORUM/images/imported/2007/11/IMG_1897-1.jpg

https://sl-i.net/FORUM/images/imported/2007/11/IMG_3630B-1.jpg

[Jedi Taxi]

put hose clamps around the exhaust rubber bushings, then tighten down, that should bring up the muffler a bit. but it doesn't always work, but its a cheap simple fix that might.