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Old 10-02-2010, 11:01 PM   #1
09suby
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Default Straight Pipe.

Hey, I have a 2009 impreza 2.5i with an intake, exhaust, and a 93 octane tune. I was wondering if I wanted to do a staight pipe would I have to tune for it, and would I gain anything powerwise from this?
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Old 10-02-2010, 11:38 PM   #2
V8Slayer
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No tune should be needed if you put a straight pipe on. Do you already have an aftermarket header or just a cat back at this point?
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Old 10-02-2010, 11:53 PM   #3
grafton
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do you know how:
a. loud a strait pipe NA subie is? ( it's stupid loud lol )
b. how crappy strait pipe NA subies sound regardless of header (raspy and did I mention ungodly loud)
C. little to no gain you'll get from going to a strait pipe from an appropriate setup exhaust
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Old 10-03-2010, 09:45 AM   #4
PA-Outback2000
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i heard a cut-out on an N/A 05 Impreza. sounded good. had borla header on it.
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Old 10-03-2010, 09:48 AM   #5
hoffmanEstates
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lol it sounds like a john deer. lmao. i have tried this.
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Old 10-03-2010, 10:45 AM   #6
u2_m4r1n3
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Get a turbo!
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Old 10-03-2010, 11:24 AM   #7
09suby
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Quote:
Originally Posted by u2_m4r1n3 View Post
Get a turbo!
lol. I wish. But the motor isnt built to handle boost.
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Old 10-03-2010, 02:01 PM   #8
nairbmik
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Oh god ... please don't get a straight pipe
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Old 10-03-2010, 02:30 PM   #9
sol_tegra
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what the heck.......just slap it on n let us know on the results, u might ending up liking it!!!
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Old 10-03-2010, 09:51 PM   #10
RaineMan
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Enjoy the extra attention from the cops!
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Old 10-04-2010, 02:56 AM   #11
iRick.
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do a straight pipe to muffler. was the best sounding..ah how I miss it. Music to my ears every day.

but it only lasted about 3 weeks before I got a ticket

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Old 10-04-2010, 10:55 AM   #12
feint05
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i did it to my old 2000 rs, sounded like ****, louder than hell
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Old 10-04-2010, 11:55 AM   #13
XanRules
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Quote:
Originally Posted by grafton View Post
do you know how:
a. loud a strait pipe NA subie is? ( it's stupid loud lol )
b. how crappy strait pipe NA subies sound regardless of header (raspy and did I mention ungodly loud)
C. little to no gain you'll get from going to a strait pipe from an appropriate setup exhaust
pretty much.
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Old 10-04-2010, 12:42 PM   #14
subarumafia700
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a guy here at school has an impreza with the 2.2, a single port header, cat delete, and a wrx cat factory exhaust from cat back and it sounds amazing, not loud at all
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Old 10-04-2010, 01:44 PM   #15
RaineMan
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Quote:
Originally Posted by subarumafia700 View Post
a guy here at school has an impreza with the 2.2, a single port header, cat delete, and a wrx cat factory exhaust from cat back and it sounds amazing, not loud at all
So did you read that before you hit "Submit"? It makes no sense.

Does he have a cat or not?
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Old 10-05-2010, 02:31 PM   #16
scoobyoutback73
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i am currently running custom made unequal length headers, with cat delete pipe, and 07 sti mid pipe with muffler. has a nice deep stock wrx sound.
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Old 12-02-2010, 12:34 AM   #17
nickd711
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just did a muffler delete on my 2.5i. not that loud at all..
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Old 12-02-2010, 12:47 AM   #18
Tenament
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Pick up some OEM WRX headers first, unless you want to sound like an integra with a bad haircut.
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Old 12-02-2010, 04:01 AM   #19
Subie25i
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When I go to the track I take my exhaust off just so I can hear the car better through my helmet. I run Borla Rep with Rallisport Racing Track Pipe, and no exhaust. The loudest you can ever get the car and I honestly love it. It's you car do what you want to do. It doesn't hurt to try. Worst case scenario you don't like it, slap your stockers back on. You won't know until you try regardless of what other people say. If I didn't live across from the police station and cops didn't give a damn, I would love to run it like that every time. But when I go to the track, I just take midpipe off and leave the axle back on the hangers. Sounds amazing. Your car, your rules. Post clips tho, if you do get a straight pipe.
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Old 12-02-2010, 09:15 AM   #20
LetItSnow
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Buddy of mine has a straight pipe on his 2.5RS. I can hear him coming from three blocks away, and he hates it enough that he's planning to replace it in the spring.

"Sounds good" is a matter of perspective. You pretty much get your choices of tone and volume... Consider what kind of impression you want to give the police, the ladies and the neighborhood, and choose from there!
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Old 12-02-2010, 02:42 PM   #21
Kevin Thomas
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Quote:
Originally Posted by 09suby View Post
Hey, I have a 2009 impreza 2.5i with an intake, exhaust, and a 93 octane tune. I was wondering if I wanted to do a staight pipe would I have to tune for it,
No, you would not have to tune for it.


Quote:
Originally Posted by 09suby View Post
and would I gain anything powerwise from this?
No-one knows for sure if there is a gain or not. At least I haven't seen any dyno proven results either way on a Subaru. Posts on other cars in other forums with dyno results showed no gains though.

http://www.8thcivic.com/forums/bolt-...o-results.html

http://www.ls1tech.com/forums/lt1-lt...-increase.html

For examples.....^^

Now if your cat is going bad then that is a different story.
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Old 12-03-2010, 11:36 PM   #22
Subie25i
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Well here's what borla reps, test pipe, and no exaust sounds like. If you run a straight pipe, more sound will be directed in the rear but will be just as loud. You will also get less vibration in the car since the exit is in the rear not in the middle. This video muffles sound but it is very loud in person.


Last edited by Subie25i; 12-03-2010 at 11:39 PM. Reason: Video embedding didn't show.
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Old 02-12-2011, 01:48 PM   #23
izdizef
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Quote:
Originally Posted by iRick. View Post
do a straight pipe to muffler. was the best sounding..ah how I miss it. Music to my ears every day.

but it only lasted about 3 weeks before I got a ticket

YouTube - straight pipe to axleback.
sounds nice. did you delete the resonator as well? and is this N/A 2.5i?
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