Why 2 Mufflers?
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Two likely reasons:
1. Size and fit. The single pre-2009 muffler is huge. Maybe it would not have fitted up under one side, but instead hung down, looking bad and affecting departure angle. Two smaller mufflers tuck up under the new body nicely.
2. Cosmetics. Dual exhausts look better.
1. Size and fit. The single pre-2009 muffler is huge. Maybe it would not have fitted up under one side, but instead hung down, looking bad and affecting departure angle. Two smaller mufflers tuck up under the new body nicely.
2. Cosmetics. Dual exhausts look better.
This is exactly why. :biggrin:
Symmetrical exhaust system,now that's funny.
My guess is that it's entirely cosmetic. It does balance the rear, but strangley enough, Subaru choose to leave the muffler cans hanging low & very visible? Some members have painted them black & they look so much better! 
Bobby...
My MODding Journal
Bobby...
My MODding Journal
I'm thinking the 2009's and up should have at least a half-dozen or so symmetrical dual exhaust system decals and badges proudly attesting to that fact. :biggrin:
Does anyone know if its a true dual exhaust?
I like that answer.
My buddy gives me crap all the time about my forester having dual exhaust. He says its ricer and stupid. If you saw his acura, thats a bit rice. My Forester still looks better then his Mazdaspeed 3 i think. And my sentra is still faster then his dsm so i could care less about what he has to say about my foresters exhaust lol. I love the way it looks.
2007 XT - 5MT ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
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1,589 Posts
^than than than please !!!
To me, a true dual exhaust runs dual all the way from the engine. On the Forester, it's a single pipe, which splits to the 2 mufflers in the rear. My simple answer would be no. :wink:
Bobby...
My MODding Journal
Not at all, it splits just before the mufflers.
They did it because the competition was doing it and people who don't know about cars want dual exhausts.
I replied to an earlier thread about this, back when the 2005 Outbacks came out, Subaru said they used Dual Exhaust for a reason given earlier in this thread, Ground Clearance. 2 Smaller mufflers were easier to fit under the vehicle than 1 large one.
Now they have recanted ...... from 2005-2009, the Legacy/Outback was dual exhaust. for 2010, they are back to single.
Go figure !!!!
Now they have recanted ...... from 2005-2009, the Legacy/Outback was dual exhaust. for 2010, they are back to single.
Go figure !!!!
....because my mom "said so". :raspberry:
The 2008-back muffler is 9.5" high and 10" wide and 17 inches long. It is a rounded box, almost as high as wide. The 2009-on muffler looks oval and shorter. I don't think there is enough room for the old box muffler to fit under one side of the new body.
Can 2009-on mufflers be hung any higher? If so, the tail pipes would have to emerge higher, requiring bigger cut outs in the bumper.
You can tell just by looking under the rear. The single pipe is split by a Wye to go to each muffler.
There are no true dual exhausts these days except perhaps on some muscle cars and muscle trucks. It requires two catalytic converters.
Rear drive V-engine and Boxer-engine vehicles lend themselves to true dual exhausts, where each bank of cylinders has its own path straight out. But very few such vehicles do.
True duals are possible on rear drive inline engines, but require a split manifold, like the old Pontiac OHC Six, and the present twin turbo BMW Six.
All the "dual exhausts" you see on new cars are "pseudo duals" because these cars are either inline 4 (like Miata) or they are transverse 4 (Nissan Altima) and these fours cannot split the manifold. Or they are transverse 6 (too many to name) or transverse 8 (Lincoln Continental) that must gather the front manifold into the rear manifold and then split the system after the converter.
All the dual-exhaust Subarus gather the left manifold into the right one. So they are all "pseudo duals", even though the boxer cylinder layout is perfect for true duals.
Correct: to keep the car quiet when there was no longer enough room for one large muffler.
Pretty sure it's for packaging reasons with the redesigned rear suspension.
Low for sure-I now have one can tucked up about an inch higher courtesy of a stump in the mud. Took off the stainless tips I installed and painted the cans flat black- now you can't see the difference in height.Subaru choose to leave the muffler cans hanging low & very visible? Some members have painted them black & they look so much better!
Bobby...
Hmm...be careful about that. With symmetrical dual exhaust system, I believe we are allowed only a 1/4" difference in the height of each muffler, as measured from the bottom of the rear diff case. :biggrin:
Steve
09 2.5X AT
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