('14-'18) Purpose of dual exhaust? - Subaru Forester Owners Forum
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post #1 of 46 (permalink) Old 03-03-2014, 03:21 PM Thread Starter
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Purpose of dual exhaust?

My '14 2.5L Touring Forester has a single exhaust. I noticed that the '13s, regardless of trim have dual exhaust. What is the purpose of a dual exhaust and why would it have been removed for the '14 model year?

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post #2 of 46 (permalink) Old 03-03-2014, 04:25 PM
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There's a good description of the reasons here:

Dual Exhaust Vs. Single Exhaust | eHow

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post #3 of 46 (permalink) Old 03-03-2014, 05:08 PM
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Here is the best quote from that link:

"Don't be fooled, though, as some dual exhaust systems are actually single exhaust, as a few manufacturers use just one manifold and split the exhaust pipe after the muffler. From behind the car you see two tailpipes, but if you follow them forward, you'll find just one pipe and one manifold. There is no horsepower advantage to a system like this."

THAT describes the Forester's dual system. It's more expensive than a single exhaust, and adds no power. So, it was apparently determined to be esthetically pleasing, perhaps using cues from the "balanced" handling marketing ideas, and, someone finally decided it wasn't worth it to put this faux-dual system on any more.
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post #4 of 46 (permalink) Old 03-03-2014, 05:17 PM
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It was a marketing decision. The competition is doing it too. The engineers are probably slowly shaking their heads.

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post #5 of 46 (permalink) Old 03-03-2014, 05:19 PM
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Glad to hear Subaru came to their senses and went back to a single exit exhaust, at least on some models.

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post #6 of 46 (permalink) Old 03-03-2014, 06:45 PM
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it's basically there to be one of the aesthetic differences in trims. Wimpy base model with single exhaust vs turbo version with dual.
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post #7 of 46 (permalink) Old 03-03-2014, 08:15 PM
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Exclamation Fake dual exhaust

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Originally Posted by Japam View Post
it's basically there to be one of the aesthetic differences in trims. Wimpy base model with single exhaust vs turbo version with dual.
The '14 turbo model has the fake dual exhaust also. It just makes the Forester weigh more and IMO provides no value.

Maybe for the '15, Subaru will provide 6-inch diameter chrome exhaust tips, four of them, or hook up the audio system to the engine speed and provide a deep V8 rumble with a switch to output the torn canvas sound of an un-muffled superbike at 14,000 RPM.

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post #8 of 46 (permalink) Old 03-03-2014, 08:23 PM
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When my mufflers rot away, I think I'll be putting together some sort of large diameter single exhaust setup on my 2013. I also want it to be just as quiet as the factory system and not look like a muffler shop job. This is where TIG welding comes in.

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post #9 of 46 (permalink) Old 03-04-2014, 05:57 AM Thread Starter
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Thanks for the input. All things consdiered, I guess I'm glad they went back to the single exhaust.
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post #10 of 46 (permalink) Old 03-04-2014, 06:01 AM
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I am one of those weird people who prefer symmetry when possible, so I really like having dual exhaust... even if it is just for looks.

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post #11 of 46 (permalink) Old 03-04-2014, 06:09 AM
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I am one of those weird people who prefer symmetry when possible, so I really like having dual exhaust... even if it is just for looks.
Me, too. And the chrome pipe tips ...

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post #12 of 46 (permalink) Old 03-04-2014, 08:39 AM
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I am one of those weird people who prefer symmetry when possible, so I really like having dual exhaust... even if it is just for looks.

Me too....Till it comes time to replace it.

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post #13 of 46 (permalink) Old 03-04-2014, 12:05 PM
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Question Aesthetics

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Me too....Till it comes time to replace it.
The aesthetics are important. To reduce cost, weight, and replacement expense, how about if Subaru sold the cars with the chrome tips on both sides, but only one side connected to a resonator and the balance of the exhaust system?
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post #14 of 46 (permalink) Old 03-04-2014, 12:24 PM
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Me too....Till it comes time to replace it.
That's when its time for a new car.... Go to a automatic touchless car wash with under body blast at least once a month and you will be surprised how long things last....
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post #15 of 46 (permalink) Old 03-04-2014, 04:18 PM
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Quote:
Originally Posted by Blackheart View Post
Here is the best quote from that link:

"Don't be fooled, though, as some dual exhaust systems are actually single exhaust, as a few manufacturers use just one manifold and split the exhaust pipe after the muffler. From behind the car you see two tailpipes, but if you follow them forward, you'll find just one pipe and one manifold. There is no horsepower advantage to a system like this."

THAT describes the Forester's dual system. It's more expensive than a single exhaust, and adds no power. So, it was apparently determined to be esthetically pleasing, perhaps using cues from the "balanced" handling marketing ideas, and, someone finally decided it wasn't worth it to put this faux-dual system on any more.
The Forester's dual exhaust is a fake??? How sad. If an engine has 5 or less cylinders or an I6, it should be single exhaust. A vehicle with a V6 or has 8 or more cylinders, it should be a 'true' dual exhaust with an 'X' pipe. Anything turbo should have 1. But should a manufacturer put a dual exhaust on, it should at least be functional and not a fake. /End rant.

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