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Old 05-28-2008, 01:43 AM   #1
Leggo
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Member#: 158613
Join Date: Sep 2007
Chapter/Region: NWIC
Location: PDX, Oregon
Vehicle:
2003 Legacy
Timberline Green Pearl

Default exhaust question?

im sure this has been asked before but im trying to figure out what its going to take to put an 07 sti catback on a 03 legacy wagon. let me know.
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Old 05-28-2008, 03:56 AM   #2
ReubenH
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Member#: 172522
Join Date: Feb 2008
Chapter/Region: International
Location: Queenstown, New Zealand
Vehicle:
1998 Legacy GTB Ltd.
Black

Default

Go ahead and figure it out for yourself

You'd be surprised by what works, i had a stock STi downpipe and midpipe fitted to my legacy before. This was MY99 STi onto MY98 GTB though, i'm willing to bet in the 10 years since then, the legacy's and STi's have grown apart... Worth a shot anyway if you already have the exhaust. But still, as your name suggest, subaru's are like lego
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Old 05-28-2008, 02:45 PM   #3
sadsack
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Member#: 102327
Join Date: Dec 2005
Chapter/Region: TXIC
Location: Aggieland
Vehicle:
2003 Legacy - RIP

Default

From what I've gather, you have to

extend the midpipe (Leggy's are longer than Imprezas)

rotate the flanges at the midpipe/axleback connection

weld new exhaust hangers on the muffler

replace the straight tip on the muffler with a bent tip (to clear the bumper)

If you've already got the STI catback, motor on down to an honest & reliable muffler shop to get an estimate. From the Impreza crowd, it costs anywhere from $80 -150. Since you'll have to add a foot of mandrel bent tubing for the extension, it might run as high as $200.

FWIW - find the most competent shop in your area. If done wrong, you'll have bad exhaust leaks and the welds will look like poo.

Please post an update once you have it installed - I want to do something similar (WRX catback for 2.25" piping, instead of 2.5" for the STI).
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Old 05-28-2008, 05:42 PM   #4
Kawikid20o2
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Member#: 86291
Join Date: May 2005
Chapter/Region: NESIC
Location: New Fairfield, CT
Vehicle:
'97 LegaSTi-2.5XTR
'96 BrightonCoupeWRX-SR30

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i dont see that working...the turbo cat doughnut is bigger than the N/A flange but the axle back would need to be extended but that flange will bolt up.
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Old 05-28-2008, 07:44 PM   #5
sadsack
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Location: Aggieland
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2003 Legacy - RIP

Default

Quote:
Originally Posted by Kawikid20o2 View Post
i dont see that working...the turbo cat doughnut is bigger than the N/A flange but the axle back would need to be extended but that flange will bolt up.
I dunno - you have to remember that we're talking about BE/BH chassis. After the 1999 model year, the Leggy platform significantly diverged from the Impreza platform, especially in the area of the rear suspension. BE/BH is multi-link, not strut, so there's a whole other bunch of "stuff" getting in the way of a "straight-through" exhaust pathway.

I agree that the STI catback is probably excessive. A 2.25" exhaust would be close enough to mate up with the stock 2"-ish flange, not to mention that 2.25" is considered optimal for conventional (i.e., no built high RPM motors) N/A applications.
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Old 05-28-2008, 08:30 PM   #6
Kawikid20o2
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Join Date: May 2005
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Location: New Fairfield, CT
Vehicle:
'97 LegaSTi-2.5XTR
'96 BrightonCoupeWRX-SR30

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ive got a BH outback in my driveway so im gunna take a look at that along with a whole mess of turbo and N/A exhaust parts and see what gives.
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Old 05-29-2008, 12:34 AM   #7
sadsack
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Member#: 102327
Join Date: Dec 2005
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Location: Aggieland
Vehicle:
2003 Legacy - RIP

Default

Quote:
Originally Posted by Kawikid20o2 View Post
ive got a BH outback in my driveway so im gunna take a look at that along with a whole mess of turbo and N/A exhaust parts and see what gives.
Please keep us posted . . . the BE/BH chassis mods are dying on the vine ever since the '05 turbo models (no turbo wagon in '06 , and no Leggy wagon at all after '07 ) hit the scene.

I'm looking for max stealth while achieving 2.25" throughout (I've already got a Cobb EL header + cat looking for a quiet catback) . . .
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Old 05-29-2008, 04:01 AM   #8
ReubenH
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Member#: 172522
Join Date: Feb 2008
Chapter/Region: International
Location: Queenstown, New Zealand
Vehicle:
1998 Legacy GTB Ltd.
Black

Default

Quote:
Originally Posted by sadsack View Post
I dunno - you have to remember that we're talking about BE/BH chassis. After the 1999 model year, the Leggy platform significantly diverged from the Impreza platform, especially in the area of the rear suspension. BE/BH is multi-link, not strut, so there's a whole other bunch of "stuff" getting in the way of a "straight-through" exhaust pathway.
Ah, agreed.. Lol. In my other post i thought leggo meant BL, not BH. 03 was the first BL/BP year in NZ and Japan.. Dealing with the non turbo BH (Closest relative the GC8, more than the GDB), and trying to stick a GDB aftermarket exhaust will feck things up for sure. Won't work.

I know however, the that previous generation (BG/BD) (Turbo models) the GTB midpipe is exactly the same as a GC8 STi. I actually have a version 5 STi midpipe on mine (it has higher flow silencers, and was free)

Quote:
Originally Posted by sadsack View Post
I agree that the STI catback is probably excessive. A 2.25" exhaust would be close enough to mate up with the stock 2"-ish flange, not to mention that 2.25" is considered optimal for conventional (i.e., no built high RPM motors) N/A applications.

Indeed, 2.25" is good, any larger and you lose torque, which is what it's all about in a 'wee' N/A.
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