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Old 08-15-2003, 03:22 AM   #1
Cao Cao
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Join Date: Jul 2003
Location: SubaruOutback.org
Vehicle:
2003 H6-3.0 Wagon
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Default H6-3.0 Performance Parts

Hey guys, I've been looking around for a while and really can't seem to find any performance parts for the Outback's H6-3.0, except for the K&N filter. Does anyone know of any parts? I've heard that you can retrofit the exhaust for a 2001-newer OB to the same setting of that of an H6-3.0 OB. Can anyone tell me if this is true. Any help is gladly appreciated
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Old 08-18-2003, 05:00 PM   #2
anders8
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someone said something about a chip or reprogramming from Cobb tuning.
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Old 04-09-2011, 10:51 PM   #3
Government Grant
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Subaru Stars H6-3.0 Performance Parts

There are some surprisingly low cost things you can do to your H6 3.0 Outback. (Mine is a 2001 model.) First - install a K&N filter. Expect about 5% fuel efficiency improvement. Second -install a flex tube (aluminum defroster type) inside the big airbox next to the intake manifold. Stretch the tube so it sticks out the exit slightly. This will give a cold air type tube effect. Thirdly - install two vortex generators. These are those devices that make the air spin as it enters the engine. Put one at the entrance to the airbox and the other between the air filter box and the sensor in the rubber flex tube. Those two changed my fuel economy from 30 mpg to 44 mpg with a slight power improvement. Fourthly - install E.3 spark plugs. (Do it from the underside - it's way easier.) At this point I knocked 3 sec. off my 0-60 acceleration. Finally, replace the muffler. You can use the 4-cyl performance system type but have to make an adapter for the larger pipe system at the front. Auto supply stores should be helpful there. I installed a basic S/S Magnaflow 4x9 size with auto supply elbows and tailpipe for under $200. I installed the system just before the snow came and haven't measured the acceleration difference yet. I lost a bit of the fuel economy, but gained even more power. The wagon looks totally stock, has great fuel economy, with the only giveaway to the performance is the exhaust tone.
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Old 04-13-2011, 01:56 PM   #4
Lega-seeyalater
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Quote:
Originally Posted by Government Grant View Post
At this point I knocked 3 sec. off my 0-60 acceleration.
With all due respect, I have a hard time with that number. Assuming, generously, that a 3.0 does 0-60 in around 7 seconds, that would mean that you had your Subie going 0-60 at around 4 seconds. That just doesn't seem possible.

Am I missing something?
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Old 04-13-2011, 03:37 PM   #5
Cole
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2008 Legacy NA Hellastock

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yeah, the part where this troll-bot also gets 44mpg

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Old 04-13-2011, 08:19 PM   #6
CosmoTheCat
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Old 04-14-2011, 09:09 PM   #7
Government Grant
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I have some information & updates on the dual vortex generated, E3 ignited H6 3.0 Outback. When I installed the E3's, it appeared to be the second set of plugs since new at about 180,000 km. My initial acceleration showed best power at about 4500 rpm, with poor power before and after (on the old plugs). My dual vortex setup also caused about 1/4" reduction in the intake pipe diameter with my tube inside the air box. The slightly starved engine lost some bottom end power then but definitely got 44 mpg. I forgot to add that I am up in God's country, where we use the Imperial gallon (160 fl. oz.). When I installed the E3's, I got a power increase throughout the whole rpm range. My 0-60 mph was 12 sec. and became 9. With the Magnaflow muffler in back, my acceleration is now about 6-7 sec. with the tranny just entering third gear. It is surprisingly smooth and even acceleration. You can choose to believe the numbers, or not. (It doesn't take much money to try it yourself.) All I know is I'm smiling all the way to the bank. An improved suspension system is next on my list. [FYI - I'm a retired auto service manager who was a member of two private racing teams.]
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Old 04-14-2011, 10:32 PM   #8
CosmoTheCat
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I absolutely do not believe you're getting anywhere near 44 mpg - Imperial or otherwise - however I do believe you're getting close-to-stock acceleration times.

Let us know when you get anywhere near 750 miles on a single fill-up.
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Old 04-28-2011, 09:19 AM   #9
PMDSOA
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I changed my power steering fluid and get close to 50mpg...
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Old 05-11-2011, 05:37 PM   #10
twagoon
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I drained my power steering fluid and got 51mpg...
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