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Old 05-30-2003, 09:23 PM   #1
Jimbo
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Default USDM STi Uppipe - Will it bolt up to WRX?

So I've done some research and confirmed that the USDM STi uppipe is catless, but have some questions that I can't find answers to:

1) Is it a direct bolt up to a stock WRX turbo?

2) How much will it cost?

3) When will it be available?

I put off buying a JDM STi uppipe due to the $300 price tag, so I am hoping this will be the way to go.

Thanks,

Jimbo
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Old 05-30-2003, 10:15 PM   #2
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My guess is yes it will

We had the downpipe off andits the same.
Ajay
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Old 05-30-2003, 10:52 PM   #3
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Probably won't be too easy to come by (cept new from a dealership) as theres no reason for STi owners to replace them. They might be cheap, but I doubt it.
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Old 05-30-2003, 11:07 PM   #4
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Quote:
Originally posted by mlambert
Probably won't be too easy to come by (cept new from a dealership) as theres no reason for STi owners to replace them. They might be cheap, but I doubt it.
Come on, you know people will replace them just so they can brag about their new parts.
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Old 05-31-2003, 10:47 AM   #5
Jon [in CT]
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Quote:
Originally posted by mlambert
Probably won't be too easy to come by (cept new from a dealership) as theres no reason for STi owners to replace them.
There never seemed to be any performance-related reason for replacing WRX bypass valves, either, but that didn't stop a lot of WRX owners from doing so.
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Old 05-31-2003, 11:08 AM   #6
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Maybe the aftermarket will develop an up-pipe for the STI with an atmo-venting BOV in it!!!!!!! Sweet!!!!!!!!!
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Old 05-31-2003, 12:19 PM   #7
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I don't care if anyone rips them off their STi - I'm considering buying one new from any of the online vendors that sell factory Subaru parts at a discount. Considering new JDM uppipes are in the $300 range, I'm hoping the USDM version will be cheaper.

Anybody know the cost?

Jimbo
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Old 05-31-2003, 12:39 PM   #8
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Or you can wait a couple extra months and buy used ones from bashed up STis and Forester XTs at your local junkyard.
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Old 05-31-2003, 02:15 PM   #9
Jon [in CT]
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Quote:
Originally posted by Jimbo
I don't care if anyone rips them off their STi - I'm considering buying one new from any of the online vendors that sell factory Subaru parts at a discount. Considering new JDM uppipes are in the $300 range, I'm hoping the USDM version will be cheaper.

Anybody know the cost?

Jimbo
Don't know the cost, but I believe the STi uppipe's part number is 44104FE090, which is handy to know when calling around among Subaru dealerships looking for the best price. If you do get a price, let us know.
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Old 05-31-2003, 07:33 PM   #10
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Quote:
Originally posted by jblaine
Maybe the aftermarket will develop an up-pipe for the STI with an atmo-venting BOV in it!!!!!!! Sweet!!!!!!!!!
I would buy that, but only if it had some pimp LED's that blinked everytime it made noise. Chicks would dig that for sure!

jon does make a fine point about people replacing stuff just because they can, not because they should.
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Old 06-01-2003, 02:03 PM   #11
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Isn't the '04 STi a twin scroll turbo?
If the '04 WRX is a twin scroll then the STi uppipe would bolt up directly to it.
If you want to put one in an '02-03, you need the new turbo too, no?
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Old 06-01-2003, 02:57 PM   #12
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Quote:
Originally posted by mikkyo
Isn't the '04 STi a twin scroll turbo?
Not in North America.
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Old 06-02-2003, 01:29 AM   #13
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I got my sti up pipe on ebay for 170. The same guy just sold one a few days ago. Check ebay. This webiste sells the sti up pipe www.rallispec.com. It cost a lil more then 300.
It will bolt on to the stock wrx turbo. Haven't installed mine yet. Waiting to get a new downpipe then install it together. Also bought all new gaskets from www.subydude.com
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Old 06-02-2003, 02:40 AM   #14
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(Frusteration sets in)

What's the point in wanting to use the UDSM STi uppipe on a WRX? Unless you got a friend with a STi that gets a aftermarket and you're too much of a cheap skate to want a quality lightweight uppipe (which usually have bigger than stock diameter). If you're looking to actually buy a brand new STi uppipe, i'd pick an aftermarket. If you're afraid Subaru will void your warranty if you use aftermarket and not stock and you're trying to cheat them out by using a catless stock pipe.. I mean... Subaru where I live encourages us to upgrade to a catless.. the mechanics at our dealer only see upgrading to a catless uppipe as a totally useful and positive thing to do to a WRX that actually reduces turbo problems and heat.. causing a healthier engine/turbo in the long run.

USDM STi uppipe = Heavy, smaller than aftermarket diameter, Expensive

Aftermarket = Super light, slightly larger diameter, and cheap

Now I realize any diameter bigger than the header's diameter makes no difference.. but if I remember correctly the stock uppipe has a smaller diameter than the stock header. (Can anybody verify?)

Jay
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Old 06-02-2003, 06:01 PM   #15
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Quote:
What's the point in wanting to use the UDSM STi uppipe on a WRX? Unless you got a friend with a STi that gets a aftermarket and you're too much of a cheap skate to want a quality lightweight uppipe (which usually have bigger than stock diameter).
Ummmm, let's see:

1) No cat = more power
2) Flex joint = perfect fit and no leaks
3) Genuine Subaru part means never having an issue passing smog visual in California or looking stock to dealers.

When I replace the upipe, I want to do it once, do it right and never look back. Jacking up my motor and removing the turbo to fix leaks is not my idea of a good time. No offense, but if I was a "cheap skate" I'd go and buy a Gruppe-S uppipe for $120. This has nothing to do with being cheap, but I don't really feel like paying $300 for a JDM pipe.

If you can't answer my question, why bother to post? Jackass.

Jon - Thanks for the P/N.

Jimbo

Last edited by Jimbo; 06-02-2003 at 06:43 PM.
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Old 06-02-2003, 06:26 PM   #16
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Diversion: gotta a question for you. How many folks overseas with WRXs & STis (those with catless uppipes) swap them out for & upgrade to other brands of uppipes? I don't recall ever seeing anyone post performance comparison numbers showing an advantage of any particular catless uppipe over the catless STi one.

I bought one from AVsport for all the reasons that Jimbo mentioned. He forgot that it also has a heat shield to help keep the heat out of the engine compartment. Since I'm a DINK the $300 didn't freak me out too much.
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Old 06-05-2003, 09:16 PM   #17
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I got my JDM catless uppipe. What is the bracket that is welded perpendicular to the heatshield & has some thread holes in it? What is supposed to mount there?
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Old 06-05-2003, 09:21 PM   #18
Zornorph
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Default usdm uppipe

I was looking at one they had laying on the counter at Exeter Subaru (AKA Subaruwrxparts.com. Brian said they were gonna sell for about $270. It had the internal flex, and seems to have a dinky interior diameter.

He said it would fit, and it looked identical to my txs in it's bolt pattern arrangement.
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Old 06-06-2003, 01:01 AM   #19
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Quote:
Originally posted by twitch
I got my JDM catless uppipe. What is the bracket that is welded perpendicular to the heatshield & has some thread holes in it? What is supposed to mount there?
That bracket is on your stock one too, it's for the heat shield. The heat shield is actually 2 pieces but I think the main one bolts to it.
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Old 06-06-2003, 03:50 AM   #20
Diversion
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They don't go swapping just the uppipe in other countries that already have a catless uppipe.. they upgrade their entire header that is either one-piece or includes a matching uppipe.

I suppose if California is that bad during smog tests to the point where they are inspecting your uppipe to make sure you have a cat there.. then I guess the STi pipe is your ONLY choice. But since you originally stated you don't want to go spending $300 on a new STi uppipe, buy a Gruppe-S at $120. First time installing a Gruppe-S uppipe and no leaks. But it's your money, I was just asking a legit question and putting out the way I see things, the answers I received were great. Thanks for giving me a chance to look at things differently, JACK ASS.

Jay
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Old 06-07-2003, 11:03 AM   #21
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esteve: thanks for the gouge on the bracket. I saw a pic where a guy was selling his jet-coated catless uppipe & it looked like he'd removed the part I was talking about.

The diameter of the catless uppipe is, as I understand it, the right size for the turbo. Having it wider won't really provide any benefit. What really helps out with uppipes is losing the cat.
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Old 06-07-2003, 11:57 AM   #22
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Quote:
Originally posted by twitch
esteve: thanks for the gouge on the bracket. I saw a pic where a guy was selling his jet-coated catless uppipe & it looked like he'd removed the part I was talking about.

The diameter of the catless uppipe is, as I understand it, the right size for the turbo. Having it wider won't really provide any benefit. What really helps out with uppipes is losing the cat.
No problem. I wonder why he'd cut off that bracket on an STi uppipe.

Yeah, as long as that restrictive cat is out of there, performance differences among different brands is very minimal.
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Old 06-09-2003, 01:03 AM   #23
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Default STI one or aftermarket

So... from what you guys are saying the STI uppipe is the same diameter as the turbo inlet... and it has a heat shield and its guaranteed to fit perfectly... so basically its the best? Any benefits for the TurboXS one or the Autospeed? PDE makes one so you can mount the heat shield back on... honestly I want the best uppipe I can get, as far as performance goes. What is it?
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Old 06-09-2003, 09:54 AM   #24
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Quote:
Originally posted by Diversion
I suppose if California is that bad during smog tests to the point where they are inspecting your uppipe to make sure you have a cat there.. then I guess the STi pipe is your ONLY choice.
gut the stocker.

even more stealth!

ken
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Old 06-10-2003, 02:01 AM   #25
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Ok...here we go...

1) The JDM STi uppipe is the same diameter as the headers and the turbo inlet. In acutality, a larger diameter uppipe will be less efficient than a proper sized one - the flow pattern on a pipe that's bigger than the surrounding connections will just mess up the gas flow in the pipe. Not much, but a bit.

2) The bracket on the back of the stock and STi uppipe is for the rear section of the heatshield on the turbo. The main top section doesn't use these two bolts. They suck to get at, but fortunately, the rear section of the heatshield slides onto the bolts you thread into there.

3) The weight difference between the STi piece and a stock one isn't much. Maybe 2 lbs. If you're concerned about 2lbs, than more power to you. Just gut your interior, remove all the sound deadening material and convert it to a pure track car.

4) I might not be quite right here, but we actually dont' want a really large diameter uppipe, or headers for that matter. After all, by giving the gasses a small escape route, you force them to accellerate to a higher speed, resulting in more force to spool the turbo up with. Think of it like a river. If you have a big, wide channel, you'll get a slow flowing river. If send the same volume through a much narrower riverbed, you get much higher water speeds! Obviously, there's a limit to this, a balance to be achieved, but just going bigger on exhaust before the turbo doesn't mean you'll make more power. It certainly means you'll create more lag as well.

I'm not unbiased about this though - I went with the STi uppipe. For the same basic reasons - fit, flex joint, visual stock appearance, heat shielding. Well worth the investment IMHO, especially given avoiding the need to remove it for eventual smog checks. The price really isn't that much more when compared to other flex joint uppipes either. I'd recommend getting it from subaruwrxparts.com - that's a good price, a bit lower than what I paid...
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