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Discussion Starter · #1 ·
I have alot of you guys email me about the up-pipe. I tend to refer some of you guys to the WRX board for that. :)


For those that dont know, this piece here is an actual up-pipe. Its for the WRX. It replaces the 1st of three cats. Its located between the exhaust manifold and the turbo. ATP calls there bov setup an UPP, an upgraded pressure pipe and some of you guys seem to have WRX envy and are calling it up-pipe. :) Here is a pic of my prototype up pipe for the WRX:



Just some Gee wizz info for you guys.
 

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between the exhaust manifold and the turbo and replacing one of the cats? I am either confusing myself back to the institute or that is a picture of a downpipe...am I still crazy? :-s
 

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isn't the 1st cat in the downpipe on the WRX? I have no idea how the WRX is set up compared to the only turbo car I know (I also know how it is on a 1993 isuzu NPR)
 

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Up-pipe....between exhaust manifold and the turbo (has a cat)

Down-pipe...runs down off of turbo (has a cat)

Mid-Pipe...between down-pipe and rear section (has a cat)

Rear section...after mid-pipe and ends in the muffler and tailpipe

Hope that clears it up. The WRX exhaust is made up of those 4 parts as well as the exhaust manifold (header).
 

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And, yes....you counted them right. There are 3 cats on a stock WRX, even though Subaru officially calls the first one (in the up-pipe) a pre-cat....it's a cat.


Now, you can try and find one on my car....good luck :wink:
 

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thanks for clearing that, billy.

And I can find a cat on your car, just gotta find the neighborhood cat and lure him onto your car with some treats. :lol:
 

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Exhaust Depot said:
I have alot of you guys email me about the up-pipe. I tend to refer some of you guys to the WRX board for that. :)


For those that dont know, this piece here is an actual up-pipe. Its for the WRX. It replaces the 1st of three cats. Its located between the exhaust manifold and the turbo. ATP calls there bov setup an UPP, an upgraded pressure pipe and some of you guys seem to have WRX envy and are calling it up-pipe. :) Here is a pic of my prototype up pipe for the WRX:



Just some Gee wizz info for you guys.

When I have used the term "up-pipe" before to nonWRX owners I have had some confusion between the up-pipe on a WRX and an upper intercooler pipe, but who knows.

And, for the record that isn't a well designed up-pipe for the WRX. A good one would have a flex in it just like the stock one; otherwise you run into problems with them cracking :(
 

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Discussion Starter · #9 ·
Billy said:
And, for the record that isn't a well designed up-pipe for the WRX. A good one would have a flex in it just like the stock one; otherwise you run into problems with them cracking :(
I beg to differ.
Have you ever looked at a stock uppipe for a REAL STI? Yup, no flex in it being that there is no cat. All the uppipes that are out there with a flex section is made for those who don't know the proper sequence on installing an uppipe. The same applies for those who have had there manifolds and uppipe flanges warp.

I am yet to see a perine or PDE uppipe crack and I have been around alot of WRX. My prototype uppipe you see there is made out of 14 gauge steel which is pretty thick and wont be cracking anytime soon. (my production one will not have welds on it).
 

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I haven't seen an STi up-pipe, but I have seen plenty of WRX up-pipes and they all have flex in them. Now, the STi comes with stiffer mounts then the WRX and that could be a reason for not having the flex because the WRX engine (on the stock mounts) shakes to high hell and I have seen many instances of cracked up-pipes.
 

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Yeah. A lot of WRX folk are hung up on the flex joint deal. From what I've seen then tend to cause more leaks and failures than they prevent. If the pipe is well made with thick flanges, AND INSTALLED CORRECTLY, you should be good to go. Yours looks very nice. 2 bungs? Keeping the factory EGT as well as a spot for aftermarket?

VV

P.S. Thanks for clearing up the up-pipe deal...I never did understand how the SRTs were supposed to have an up-pipe when the turbo is part of the manifold.....(now that would be a feat :evil: )

Exhaust Depot said:
Billy said:
And, for the record that isn't a well designed up-pipe for the WRX. A good one would have a flex in it just like the stock one; otherwise you run into problems with them cracking :(
I beg to differ.
Have you ever looked at a stock uppipe for a REAL STI? Yup, no flex in it being that there is no cat. All the uppipes that are out there with a flex section is made for those who don't know the proper sequence on installing an uppipe. The same applies for those who have had there manifolds and uppipe flanges warp.

I am yet to see a perine or PDE uppipe crack and I have been around alot of WRX. My prototype uppipe you see there is made out of 14 gauge steel which is pretty thick and wont be cracking anytime soon. (my production one will not have welds on it).
 

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Discussion Starter · #12 ·
All of the first uppipes to come out did not have any flex sections. I forgot the name of the first one that had a flex, i think it was MTR and it was about $300 or so.

Anyways, after all the kids started having problems installing there UP due to leaks, then everyone else started using flex sections. If you notice, the two most popular UP dont come with any flex section. Due to the size of the UP diameter, you create some turbulance with the flex on the uppipe, its not an issue on the down pipe though.
 

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Exhaust Depot said:
Billy said:
And, for the record that isn't a well designed up-pipe for the WRX. A good one would have a flex in it just like the stock one; otherwise you run into problems with them cracking :(
I beg to differ.
Have you ever looked at a stock uppipe for a REAL STI? Yup, no flex in it being that there is no cat. All the uppipes that are out there with a flex section is made for those who don't know the proper sequence on installing an uppipe. The same applies for those who have had there manifolds and uppipe flanges warp.

I am yet to see a perine or PDE uppipe crack and I have been around alot of WRX. My prototype uppipe you see there is made out of 14 gauge steel which is pretty thick and wont be cracking anytime soon. (my production one will not have welds on it).
Actually the STi uppipe does have the same type of flex as the OEM WRX (North America version) uppipe... it just doesn't have the pre-cat. STi on the left, OEM on the right... both have that crinkle area of flex... not the braided style of flex seen on some exhausts.




I've not heard of cracking problems regarding uppipes, but a number of leaking problems. Which can be attributed to improper installation and/or lack of flex in uppipe.

Check out this latest posting at ClubWRX.com for info regarding uppipe leaking (if you're interested):

http://www.clubwrx.net/forums/showt...ecfc468e87&threadid=8534&highlight=sti+uppipe

here's a snip...

=====================================
here's the percentage of which brands leak the most based on how many are leaking out of the number bought from each brand.

ATR..............6..........1..........17%
Godspeed...25.........6..........24%
M2...............3..........1..........33%
Perrin..........5..........2..........40%
PDE.............6..........2..........33%
TurboXS......4..........0..........0%
Vishnu........13.........5..........38%
Other..........5..........2..........40%
JDM STi........3..........0..........0%
MRT Flex......2..........0..........0%

as a financial analyst, i would say the following

1) not all the same people voted in each poll. this is the case for a number of reasons, but most obviously, the lack or a "no leak" option on the leaking poll, and the similar counts in samples for each test.

2) all of the pipes with the supposed zero percentage leaking are too small a sample to support that figure. they could in fact be some of the worst, however, i don't think it's coincidence that NONE of the JDM or MRT have leaked. <opinion>

3) Vishnu and Godspeed are the only pipes with enough market share to make any assumptions. i would say that if Shiv's share was similar to Godspeeds, the number would fall closer to 25%.

i stand by the school of thought that all these polls prove is that 1/4 of all installs are done incorrectly, or that eventually, the vast majority of all pipes will leak, and it's just the timing of the leaking that we see here.

======================================
 

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It was MRT.

I just look at it like this...if the factory unit has a flex, then I want my aftermarket one to have it as well. Installing mine wasn't an issue because I everything out of the way while doing a turbo swap.

 

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bubba said:
isn't the 1st cat in the downpipe on the WRX? I have no idea how the WRX is set up compared to the only turbo car I know (I also know how it is on a 1993 isuzu NPR)
Check out this very nice diagram on the exhaust for the WRX. Shows it very well. Only thing missing is a route from the BOV/BPV/Diverter back to the intake tact before the turbo.



Hope this helps clear things up!
 

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Discussion Starter · #17 ·
The reason the factoy one has a flex is due the the added weight. Its alot heavier than a regular UP. The STI has no flex and the mounts have nothing to do with it because the manifold and turbo are all strongly secured to the engine and the stock exhaust system has donut gaskets and spring bolts so you dont haev addes stress on the turbo.


Saying an UP is poorly designed just because it does not have flex is a bad statement. As I stated before, the top 2 UP dont come with any flex. If you want a flex section then thats cool, but it will only make it easier to install for an additional $100 +. IM yet to see a top of the line UP crack.
 

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Billy said:
It was MRT.

I just look at it like this...if the factory unit has a flex, then I want my aftermarket one to have it as well. Installing mine wasn't an issue because I everything out of the way while doing a turbo swap.
Great pic Billy... I was unable to find one with the heat shields removed. The JDM STi uppipe has this same type of flex on it... just like the OEM your picture shows.

Not slamming anyone (Exhaust Depot) for making non-flex uppipes. Many people are using them without any problems. And Exhaust Depot... your piece looks nice.
 

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holy shit :shock:
i thought our exhuast was a little screwy :oops:
 

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Exhaust Depot said:
The reason the factoy one has a flex is due the the added weight. Its alot heavier than a regular UP. The STI has no flex and the mounts have nothing to do with it because the manifold and turbo are all strongly secured to the engine and the stock exhaust system has donut gaskets and spring bolts so you dont haev addes stress on the turbo.


Saying an UP is poorly designed just because it does not have flex is a bad statement. As I stated before, the top 2 UP dont come with any flex. If you want a flex section then thats cool, but it will only make it easier to install for an additional $100 +. IM yet to see a top of the line UP crack.
The stock exhaust system has spring bolts, etc. down the line where the downpipe connects to the midpipe, but I haven't seen them anywhere else.

The up-pipe you pictured looks nicely made, I just wouldn't buy it based on the fact that it doesn't have the flex...just me. I have seen and heard of up pipes cracking without the flex and I just didn't want to deal with that hassel. As for the ease of installation? I personally can't see the flex making a huge differance in installation, but like I said before I had that whole side of my engine bay torn down doing my turbo swap when I installed mine.

Call me crazy but I tend to trust the people that build and test their products on their rally car before offering them to the public as opposed to looking at which brand had the most sales here in the US. People here aren't going into modding the rex in the right frame of mind. They are of the frame of mind that they can just throw some sub-par parts at it and get decent results...it doesn't work that way. You've got to pay to play and you get what you pay for.
 
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