First Subaru, exhaust questions.

courtjesterclown · Post by **courtjesterclown** » Tue Nov 27, 2007 6:08 am

So i just purchased my first subaru and turbo car. ITs a 1994 subaru legacy turbo sedan, auto tranny. I've looked through several of the threads and it seems that a WRX downpipe will bolt right up, is this correct? So could i run a 3in. from the downpipe back and should i buy a kit or have the muffler shop do it themselves. Keep the cat. converters?, what type of mufflers. Im sorry to sound so repetitive with all this stuff, but i hate to buy the wrong parts or things i don't need. Any help is appreciated. Also constructive criticism on how to properly post on here is welcomed as well, haha.

Aerotech · Post by **Aerotech** » Tue Nov 27, 2007 6:33 am

Hi, and welcome to the group.

First off, familiarize yourself with the search feature of the site, there's two: the google tab at top right, and a better one in the text tabs top middle.
I'm sure most of your questions have been well answered before.

The short answer is, yes, a WRX or STI downpipe will bolt up to the turbo... but the mount tabs on the rest of the pipe probably won't line up with the Legacy. Take it to a muffler shop to have new hangars welded on. The rest of the system may have to be fabbed, or at least extended, since the Leg. is a bit longer in the tail. No big deal to an experienced shop.
I would keep the cat, but use a Hi-flow, performance cat (3" are readlily available, about $100) keeps the Feds off your back, and better for the environment... also damps the raspy edge of the exhaust, gives you a mellow, deep exhaust note.
Mufflers are pretty much a personal choice, as they all function the same, just look different. I'm running a Brullen twin-tip, looks similar to stock, but w/ rolled, angle cut chrome tips... a lot of guys run the fart cannons, it's down to your taste. (Or lack thereof!

)

Enjoy the car, and if you can't find an answer in a search, post it up!

smh0101 · Post by **smh0101** » Mon Dec 03, 2007 7:24 am

3in is good if your plannin on building it... But can be a bit loud on these... Thankfullly, unless you put equal length headers.... it wont sound like a honda

courtjesterclown · Post by **courtjesterclown** » Mon Dec 03, 2007 7:37 am

Awesome, i just purchased a bellmouth downpipe, 4inch at the turbo flange and 3 inch at the back. I am now thinking about using a glasspack muffler in the middle of the exhaust as a resonator and then a ebay fart can at the back. Anybody see a problem with this setup, also will my ground clearance be severely affected with this?

smh0101 · Post by **smh0101** » Mon Dec 03, 2007 7:41 am

oh boy... ricerific with a prison bitch muffler... oh boy ...

courtjesterclown · Post by **courtjesterclown** » Mon Dec 03, 2007 7:56 am

haha, your saying that like its a bad thing. j/k. I dont think the system will be too ricer. From what i've read a glasspack muffler halfway thru works as a quality resonator and tones the whole thing done and gets rid of that raspy tone. Im a poor college student, so these uber-expensive exhaust systems are not an option.

smh0101 · Post by **smh0101** » Mon Dec 03, 2007 8:06 am

I to am a poor college student! lol

I have a freind who is helpin me out with a full 3in turbo back...

555BCTurbo · Post by **555BCTurbo** » Tue Dec 04, 2007 4:48 am

courtjesterclown wrote:Awesome, i just purchased a bellmouth downpipe, 4inch at the turbo flange and 3 inch at the back. I am now thinking about using a glasspack muffler in the middle of the exhaust as a resonator and then a ebay fart can at the back. Anybody see a problem with this setup, also will my ground clearance be severely affected with this?

That'll sound great...

It might look at bit on the jDemmm tYte side though...

smh0101 · Post by **smh0101** » Tue Dec 04, 2007 5:00 am

555BCTurbo wrote: It might look at bit on the jDemmm tYte side though...

Haha...

courtjesterclown · Post by **courtjesterclown** » Tue Dec 04, 2007 6:06 am

haha, do i note a hint of sarcasm there? I guess im not following on what jDemmm tYte is meaning. TEll me this isnt gonna sound like crap. Just tell me. haha.

asc_up · Post by **asc_up** » Tue Dec 04, 2007 9:14 am

it won't sound like crap at all. they're just poking fun at the fart can idea. but regardless of that, it'll sound awesome. no worries.

courtjesterclown · Post by **courtjesterclown** » Wed Dec 05, 2007 7:43 am

Will using the Bellmouth downpipe design that starts at 4 inch and tapers into 3 inch hurt the low end power significantly versus a 3 inch all the way downpipe?

555BCTurbo · Post by **555BCTurbo** » Wed Dec 05, 2007 8:15 pm

courtjesterclown wrote:Will using the Bellmouth downpipe design that starts at 4 inch and tapers into 3 inch hurt the low end power significantly versus a 3 inch all the way downpipe?

No, it will be fine...

Exhaust diameter on turbo motors does not really affect low-end power...because the turbo already places a significant restriction on the engine, so anything after the turbo can be as open as desired.

courtjesterclown · Post by **courtjesterclown** » Tue Dec 11, 2007 8:52 am

SO i've been reading alot of posts about boost creep. It seems that whenever you modify the exhaust in any way, you will experience some sort of boost creep. Will installing this 3 inch turbo back system cause the boost to creep into un-safe levels and hit fuel cut? I dont have a boost gauge or boost controller.

vrg3 · Post by **vrg3** » Tue Dec 11, 2007 4:02 pm

Where have you read that? Maybe you're thinking of new age STi models? Many of us here have modified exhausts without boost creep; the only exception I can think of is magicmike (I think), who had boost creep with a VF39 (the turbo the STi comes with from the factory).

You'll be fine with an upgraded exhaust on an otherwise stock BC turbo.

555BCTurbo · Post by **555BCTurbo** » Tue Dec 11, 2007 9:31 pm

I get a small amount of boost spike, but no creep...

The spike is generally attributed to the bellmouth downpipe...so your best bet would be to eventually get a divorced tube downpipe.

yazmo · Post by **yazmo** » Thu Jul 22, 2010 8:23 pm

helllo i have found this its localy for me not sure if this is good.
but its been a while i am thinking o getting i new downpipe and i found this

http://montreal.kijiji.ca/c-autos-et-ve ... Z214513842

what do you think keep in mind that i want to boost my car around 16 psi with the correct mod.
just looking around is 4 1/2 work out ?

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First Subaru, exhaust questions.

First Subaru, exhaust questions.

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