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Old 10-05-2006, 03:22 AM   #1
FOV
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Question up pipes ?

So i've heard that this will greatly increase HP, air flow, takes out the stock cat blah blah blah.....but at the same time as i look at all of the various types of up pipe and the costs....i'm trying to figure out why some cost 370 and others only cost 170....they both look the same....have the same dia. What gives ? Is it the material ? shape appears to be the same ....

also from what i've read, the sensor in the uppipe isn't used for engine management in any way shape or form....true ? Not true ? Are there any experts out there ? Where is the subie god with all of my answers to lifes most important questions ?!
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Old 10-05-2006, 04:57 AM   #2
prometheum
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they are pretty much all the same, some have egt bungs and some don't. the egt is just used to moniter the cat in the stock one iirc. if you want one i've got an invidia one fs
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Old 10-05-2006, 05:25 AM   #3
redl1newrx
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i've tried lots of uppipes from ebay to vishnu and they all feels the same to me...
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Old 10-05-2006, 12:27 PM   #4
JordyB
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Some of the cheap ones from ebay do not fit 100%!!!

There is a thread around here were someone tried to git a ebay up and I don't think it even fit at all...to bad Jerry isnt around to answer more.

Anyone with an uppipe, why don't you post about your stories!
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Old 10-05-2006, 12:43 PM   #5
edo2000
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From what I understand, if the fitment is OK, there is no discernible difference. Buy from a known vendor, or gut the stock UP, to avoid fitment problems, as Jordy said. I have a helix flex UP, zero install problems. It was fairly reasonable $160 + shipping, a couple of years ago. But, a gutted stocker is cheaper! Don't forget new gaskets, its too nasty of a job to do it twice.
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Old 10-05-2006, 05:06 PM   #6
EvolvedAK
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Quote:
Originally Posted by JordyB View Post

Anyone with an uppipe, why don't you post about your stories!
Buy OEM style gaskets.. Either from subaru or Gruppe-s...but expect a VERY long shipping from Gruppe-s.. ive been waiting 2.5 weeks and still not steering rack bushings..

Anyways...buy new gaskets...and make sure you put everything on right..that is all.
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Old 10-05-2006, 05:46 PM   #7
02redwagone
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Bought a stock unit from OrionAk, gutted it with caveman like precision, brought it to Jerry , Jerry got it welded bungless, got it installed, It sang a loud screaming song when in boost, back to Jerry's , Beer and a new gasket later it is
done WAY under aftermarket cost.

Moral: Gut a stocker and use new gaskets FTW.
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Old 10-05-2006, 08:22 PM   #8
00Maddog
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Quote:
Originally Posted by JordyB View Post
Some of the cheap ones from ebay do not fit 100%!!!

There is a thread around here were someone tried to git a ebay up and I don't think it even fit at all...to bad Jerry isnt around to answer more.

Anyone with an uppipe, why don't you post about your stories!


i'm always around somewhere.....

yeah i had a ebay unit (subydady's) that the holes were drilled wrong, but the vendor was very concerned and dealt with the situation. so maybe they're ok nowdays.

a gutted stocker is a good upgrade. the stock sti unit is about 1/8 to 1/4 inch larger diameter all the way through, possibaly making it better? but, the sti stocker cost 300+ oem, making it more than most aftermarkets. the best aftermarket i've seen is cobb by far, as it's made from cast iron which retains more heat to spool. both stock options also have heat shields which help retain heat. many aftermarkets do not have shields and are thin metal, which leads to heat loss and more lag.

anyway, long story short i (yes it's opinion guys ) think a gutted stocker is ample for a tdo4, but i would think the sti or cobb unit would flow more for bigger turbos/boost. if you can find a used sti unit expect to pay around 100. the little known secret is bosal makes an identical pipe for ~170ish, new, i think it's the exact same unit as subarus minus the logo.

so if you're cheap, gut one. hit me up if you need one to gut, i'll just trade you for your stocker when you're done.

if you want something better get the used sti, new bosal, or top line cobb unit. if you do buy the cobb unit get it without the bung drilled as thats a poor place for an egt sensor.

jerry

o yeah, as for flex sections, it makes good sense to have one due to expansion/contraction, but i have seen few problems from non-flex units. they're just a little harder to install sometimes, and very rarely the lower gasket will give out.
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Old 10-05-2006, 10:25 PM   #9
ponamy
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Quote:
Originally Posted by 00Maddog View Post
many aftermarkets do not have shields and are thin metal, which leads to heat loss and more lag.
sorry off topic with this one

this is why i like my aps downpipe, like 1/4 inch thick and made of cast iron just for the above reason. plus the heat shield wouldnt fit back on

wonder if aps makes an uppipe thats similar to the downpipe in grade and thickness
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Old 10-06-2006, 07:38 AM   #10
prometheum
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Quote:
Originally Posted by edo2000 View Post
From what I understand, if the fitment is OK, there is no discernible difference. Buy from a known vendor, or gut the stock UP, to avoid fitment problems, as Jordy said. I have a helix flex UP, zero install problems. It was fairly reasonable $160 + shipping, a couple of years ago. But, a gutted stocker is cheaper! Don't forget new gaskets, its too nasty of a job to do it twice.
160? just get a name brand one from ebay for $40 cheaper
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Old 10-06-2006, 09:16 PM   #11
FOV
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so based off of what everyones said, it sounds to me like its time for a new turbo, intercooler, and uppipe.......there are a few people that owe me money and that money has finally made its way back....*shrugs* mise well spend it....cabo's not till new years

yea jerry i was lookin at the cobb uppipe.....sorta spendy, but could be worth it......i'll let ya know
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Old 10-07-2006, 05:49 AM   #12
ponamy
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all i know is the aps downpipe is heavy duty, really i wouldnt be too worried about what brand uppipe you get though. from what i heard as well is that they all seem close to the same, at least from most of the big name brands. i wanna buy an a/m uppipe myself soon as soon as i get my AP.

basically as long as its straight through flowing(no cat) it should be alright to use if it fits
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Old 10-08-2006, 04:58 AM   #13
00Maddog
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sounds like the aps one is similar to the cobb unit. got any pics?
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Old 10-08-2006, 08:00 PM   #14
ponamy
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sorry none with it off the car, i can take one with it on if that can help
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Old 10-10-2006, 06:40 PM   #15
03bluwrx
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ok. this question is for jerry or anyone that knows any better.

i have the option to buy a used sti uppipe for 100$ shipped. since im not planning on upgrading the turbo.. will it actually decrease my performance over a gutted stock wrx one? *this is going into the stock exhuast piping*


or i can buy a gutted stock wrx uppipe + a gutted stock downpipe for ~120$ shipped.

thx
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Old 10-10-2006, 07:39 PM   #16
edo2000
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Quote:
Originally Posted by 03bluwrx View Post
ok. this question is for jerry or anyone that knows any better.

i have the option to buy a used sti uppipe for 100$ shipped. since im not planning on upgrading the turbo.. will it actually decrease my performance over a gutted stock wrx one? *this is going into the stock exhuast piping*


or i can buy a gutted stock wrx uppipe + a gutted stock downpipe for ~120$ shipped.

thx
Jerry knows way better than me. But IMO, an STI UP wont decrease your performance, but you probably wont notice any difference between it and a gutted stocker, while you're running a stock turbo. The DP is a different story. A gutted stock DP is way more restrictive than a decent aftermarket DP. This will be expecially noticable when you upgrade to a turboback exhaust(notice, I don't say if, I say WHEN).

I would go with an aftermarket DP.
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Old 10-10-2006, 10:27 PM   #17
00Maddog
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the sti up is larger i.d. then the gutted stocker by about 1/8". and the gutted stocker has a buldge where the cat was, buldges never flow better then straight pipe. so i would say the sti one is better.
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Old 10-14-2006, 10:41 AM   #18
jmufkinc
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Look guys they all perform the same an 1/8th in diameter isnt gonna change a thing but make you feel better about other small issues! lol the only thing you need to worry about is heatsoak therefore the best call is the stocker gutted for heatshields and fitment purposes. Just buy someones old stocker or if you have the means put your baby down a couple days and gut yours. just be sure its clean and your gaskets are in good shape. I had done that project a few times when I was still in ak. Any ?'s shoot em my way.
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Old 11-25-2006, 02:04 PM   #19
WRXfoME
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I installed an ebay exhaust, no problems really. The only thing is I think the ID on the uppipe was way too much bigger than the stock one. Maybe a good 1/2 bigger ID. After installing it, my cars boost spooled incedibly fast, but, it would hit its peak and then start bouncing up and down, up and down. Im sure its from the uppipe, my ECU seems like its trying to figure out the right AF/R to work with everything right. My car is starting to settle down on a boost it likes (its not bouncing anymore), but, the boost is down to like 10-11 psi. Anyone ever hear anything about uppipes that have too large an ID? Also, is this something that can probably be fixed with an Accessport and a good tune? As of now I just have a turboback exhaust and my uppipe.
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Old 11-25-2006, 02:12 PM   #20
bradfield
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I agree with Jerry if upgrading your turbo cobb cast uppipe FTW
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Old 11-25-2006, 10:07 PM   #21
xuncriedxtearsx
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ummm mine is not catted so its stock..........works great? lol sorry for no help but i assume yours is catted so definintly cobb's uppipe, its cattless and get with EGT Bung, and cattless dp. FOR SURE!
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