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Old 09-17-2012, 04:14 PM   #101
myrt1987
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Can you keep the muffler unbolted like that 1st video? It doesnt hurt mpg or add vibration to car or anything?

I wanna try it!
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Old 09-17-2012, 07:21 PM   #102
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Quote:
Originally Posted by myrt1987
Can you keep the muffler unbolted like that 1st video? It doesnt hurt mpg or add vibration to car or anything?

I wanna try it!
You can just to try it. What I did on mine, I installed magnaflow muffler, and deleted the resonator. It's sounds good and not too loud.
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Old 09-18-2012, 09:38 AM   #103
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Well i unbolted one of the bolts on the flange so the connection was cracked open a bit. added some rumble, liked what i heard, and drove to work.

...well... i forgot to take into account the fact i have a cvt and therefore the rpms hardly fluctuate.

Needless to say i will be securing the muffler back.
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Old 11-05-2012, 10:51 PM   #104
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what is the exhaust diameter on the 2012 impreza?
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Old 11-06-2012, 12:04 AM   #105
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Is the 2 bolt 2" flange the correct size for the 2012 sport premium?
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Old 04-12-2013, 01:16 AM   #106
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Quote:
Originally Posted by MjSub2.0 View Post
You can just to try it. What I did on mine, I installed magnaflow muffler, and deleted the resonator. It's sounds good and not too loud.
can you post vid. of your exhaust? Would be great if i could hear it!
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Old 04-12-2013, 10:55 AM   #107
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youtube for magnaflow in 2.0i also check the exhaust thread in the naturally aspirated section
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Old 04-12-2013, 10:58 AM   #108
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This is what you will sound like with axle back
I like it
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Old 04-12-2013, 11:46 AM   #109
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Hmm. Maybe have a shop put in an electric exhaust cutout right before the muffler?
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Old 04-19-2013, 12:58 AM   #110
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Lots of people doing exhaust now. Not that it's a race or anything, but he'll ya I've still got the most views on YouTube for the new impreza exhaust sounds. I feel like there isn't much of a difference in sounds from all the different ones I've heard. So, I'm glad I just took the stock muffler off and had the turn-down made for only $50, plus it saves weight.
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Old 08-11-2013, 04:16 AM   #111
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I have a 2012 stock Impreza N/a sedan and I pulled the muffler off added a removable flange with a down pipe and did it for about a month sounded ok but I did notice my mpgs go from 29-32 down to 22-27 also a considerable diffrence in low end torque your better off getting an actual weld on muffler
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Old 08-11-2013, 09:39 AM   #112
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Quote:
Originally Posted by WolfPackImpreza55 View Post
I have a 2012 stock Impreza N/a sedan and I pulled the muffler off added a removable flange with a down pipe and did it for about a month sounded ok but I did notice my mpgs go from 29-32 down to 22-27 also a considerable diffrence in low end torque your better off getting an actual weld on muffler
Probably because you've been driving it harder to hear the sound. I recently did the same thing Andy msgs went down, but that's because I would shift at 4000rpm instead of 2-2500. Sounds good though!
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Old 08-11-2013, 10:09 AM   #113
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My mpg also went down with a muffler delete and I wasn't driving it any harder. Also a noticeable loss of low end torque. Get a muffler welded on.
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Old 08-11-2013, 10:43 AM   #114
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Quote:
Originally Posted by forester06x View Post
My mpg also went down with a muffler delete and I wasn't driving it any harder. Also a noticeable loss of low end torque. Get a muffler welded on.
Weird, I've been getting same mileage as before exhaust delete, not sure about loss or gain of any torque or power
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Old 08-11-2013, 11:05 AM   #115
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Quote:
Originally Posted by myrt1987 View Post
Can you keep the muffler unbolted like that 1st video? It doesnt hurt mpg or add vibration to car or anything?

I wanna try it!
I've had the mufflers from my 2011 wrx unbolted from the flange for the majority of the time I've owned it. The exhaust is fine, flanges are fine the area underneath the car is fine and I can see no argument outside of "do it because I said so" to not just leave it unbolted.I have never even been looked at funny by cops. It's really not that loud unless you're on it hard - the average Honda with exhaust is louder.

Cat back provides the same result for a lot more money. Imo just unbolt them until it's time to go tbe.

Edit: to clarify the mufflers etc are still present. The flange has just been unbolted and I've removed the gasket/inserted spacers.
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Old 08-11-2013, 11:24 AM   #116
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Quote:
Originally Posted by gregorz4 View Post
Weird, I've been getting same mileage as before exhaust delete, not sure about loss or gain of any torque or power
N/A could potentially see some torque/low end power loss due to backpressure loss / exhaust scavenging. But u wouldn't expect it to be overly much.

Turbo cars want as little back pressure downstream of the turbo as possible.
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Old 08-11-2013, 12:03 PM   #117
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Back pressure is not applicable to this. In theory it's the same setup as a full pass through muffler with no baffles/restrictors, sound chambers....etc, just nothing nothing to muffle it. It's got 2 cats and the resonator on the system before it exits the rear. If you've noticed an mpg loss, it's because you're driving more spirited. I also doubt we're losing any low end torque. For the same reason a muffler design for an axle-back application has anything to do with power.
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Old 08-11-2013, 01:12 PM   #118
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Quote:
Originally Posted by o0Spoony0o View Post
N/A could potentially see some torque/low end power loss due to backpressure loss / exhaust scavenging. But u wouldn't expect it to be overly much.
It's not backpressure loss. It's more exhaust velocity.

For N/A cars, you're talking a different between a few RPMs of a shift in your torque curve. Very insignificant in the real world to me.
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Old 08-11-2013, 04:39 PM   #119
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Quote:
Originally Posted by apexracer View Post
Back pressure is not applicable to this. In theory it's the same setup as a full pass through muffler with no baffles/restrictors, sound chambers....etc, just nothing nothing to muffle it. It's got 2 cats and the resonator on the system before it exits the rear. If you've noticed an mpg loss, it's because you're driving more spirited. I also doubt we're losing any low end torque. For the same reason a muffler design for an axle-back application has anything to do with power.
At first I would shift later to hear it but I got over it fast and was driving Econo style with shifts around 2500 rpm. When I autocrossed my car last weekend I had trouble getting off the line and powering out of corners so if your around town yes you probably won't notice the torque loss but if you actually try and push your car it won't actually move as fast as it should
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Old 08-11-2013, 04:48 PM   #120
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Quote:
Originally Posted by WolfPackImpreza55 View Post
At first I would shift later to hear it but I got over it fast and was driving Econo style with shifts around 2500 rpm. When I autocrossed my car last weekend I had trouble getting off the line and powering out of corners so if your around town yes you probably won't notice the torque loss but if you actually try and push your car it won't actually move as fast as it should
could it possibly be the vdc or the throttle control?
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Old 08-11-2013, 05:01 PM   #121
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Quote:
Originally Posted by apexracer View Post
Back pressure is not applicable to this. In theory it's the same setup as a full pass through muffler with no baffles/restrictors, sound chambers....etc, just nothing nothing to muffle it. It's got 2 cats and the resonator on the system before it exits the rear. If you've noticed an mpg loss, it's because you're driving more spirited. I also doubt we're losing any low end torque. For the same reason a muffler design for an axle-back application has anything to do with power.
Except back pressure is critical to NA performance. It ain't like a turbo where you want the exhaust to exit as quickly as possible.

Quote:
Originally Posted by Smoke View Post
It's not backpressure loss. It's more exhaust velocity. For N/A cars, you're talking a different between a few RPMs of a shift in your torque curve. Very insignificant in the real world to me.
No. The exhaust isnt traveling any faster, it's just a bigger pipe for it to exit through. It IS a lack of back pressure.
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Old 08-11-2013, 05:26 PM   #122
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Old 08-30-2013, 02:06 AM   #123
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I've really been debating doing the flange/downpipe, but came across this while checking out sound clips:

If the price is right, This is definitely the direction I will go. Though as far as I know, Borla stuff can be pretty pricey. Can't wait 'til October!
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Old 08-30-2013, 04:35 PM   #124
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Originally Posted by RNFNR View Post
I've really been debating doing the flange/downpipe, but came across this while checking out sound clips:
Borla R&D - 2013 Subaru Impreza HB 2.0L NA - 11843 Rear Section Exhaust - YouTube

If the price is right, This is definitely the direction I will go. Though as far as I know, Borla stuff can be pretty pricey. Can't wait 'til October!
Do you know if there are any additional cuts and welding that need to be done or is it just a simple plug and play?
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Old 08-30-2013, 05:06 PM   #125
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Originally Posted by Byzantium View Post
No, a muffler delete is definitely rice, and they sound very bad as the muffler adds refinement to the sound.
The Dude: "That's like... your opinion, man."
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