UpPipe questions... - Subaru WRX Forum
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post #1 of 22 Old 01-23-2008, 05:36 PM Thread Starter
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Question UpPipe questions...

I have got a few questions concerning UpPipes...
-Does the diameter of the UpPipe really matter?
-Does the quality of UpPipe matter? Like would it matter if i bought this cheesy EBAY one eBay Motors: UP PIPE UPPIPE FLEX 02-05 03 04 SUBARU IMPREZA WRX STI (item 300193158943 end time Jan-29-08 20:58:03 PST)
or would one like this be better eBay Motors: Invidia Stainless Up Pipe Subaru WRX / STi 2002+ Uppipe (item 370016292982 end time Feb-01-08 17:10:30 PST)
-And finally, should i get one with a flex joint or not? Does it affect performance with one?
Thanks...

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post #2 of 22 Old 01-23-2008, 09:16 PM
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i bought the full ebay set but some people have said they can leak where the flex is. so i bought the invidia one and it's worked fine. for the 100 bucks it's worth it i think. flex is nice but you need a higher quality one to make it worth it.
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post #3 of 22 Old 01-23-2008, 09:17 PM
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oh and 3 inch is good but i don't think it matters a huge bunch.
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post #4 of 22 Old 01-24-2008, 12:31 AM
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Well actaully i bought the invidia one and it does work great. The flex is in order to PREVENT leaking at the flanges and make installation a little easier. They dont make 3 inch up pipes, only up pipes that match the diameter of your manifold. However the good ones have a taper on the side that it meets with the manifold in order to bring a little more exhaust and compress it to increase the velocity of your exhaust to spool the turbo quicker. My best advice get the Invida, it doesn't cost an arm and a leg, and the flanges are super thick so leaking isn't going to be an issue. Also it comes with brand new studs to put on your turbo, so u dont have to reuse the stock stressed ones.

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post #5 of 22 Old 01-24-2008, 09:36 AM
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Quote:
Originally Posted by WagonLuv View Post
Well actaully i bought the invidia one and it does work great. The flex is in order to PREVENT leaking at the flanges ones.
Nope, the flex joint is in place to make installation easier, NOT prevent leaks. That is where most people get leaks (on the actual pipe itself, not between), on the mesh flex.

The invidia UP is great.

Mike
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post #6 of 22 Old 01-24-2008, 09:41 AM
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I would get the Invidia over the other one,even though flex sections work better. I would also look into buying a used STi up-pipe, as they can be found cheaply.
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post #7 of 22 Old 01-24-2008, 05:22 PM
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The flex joint makes things easier for installation but causes turbulence in the exhaust flow, and is prone to break down and leak at the flex section. I would go with a name brand over the Ebay no name stuff. The Ebay quality is hit or miss. Some people have good luck them and some do not. I had a Perrin UP and now an Invidia UP modded for EWG. Both have fit great with no leaks and do not have a flex section.

My name is Ken and I am a HP Junkie.
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post #8 of 22 Old 01-24-2008, 10:34 PM
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getting a large diameter upipe will cause the exhaust gas's to slow down a little bit..stay with stock diameter unless you are going with a huge turbo (35r or something like that)...just do a lot of research when buying your uppipe because there are a lot of less than great ones out there that will start leaking at the flex joint.
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post #9 of 22 Old 01-25-2008, 08:09 AM
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I purchased an ebay UP without the flex joint in for about $50 shipped. Came with new studs and a plug for the bung. Whatever you do, though, I would suggest picking up some OEM gaskets to go on there as the new ones tend to go out pretty quick. Other than that I have no complaints.
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post #10 of 22 Old 01-25-2008, 05:50 PM Thread Starter
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so what would you guys recomend, either the invidia UP or the HKS UP? both can be found for quite cheap, and i trust both companies

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post #11 of 22 Old 01-25-2008, 05:57 PM Thread Starter
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and, should i buy new gaskets for the UP, DP when i get them? I looked at the HKS UP on ebay, and the pic they took shows gaskets with the UP, does it come with it?

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post #12 of 22 Old 01-25-2008, 05:57 PM
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Invidia

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post #13 of 22 Old 01-25-2008, 06:05 PM
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Quote:
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and, should i buy new gaskets for the UP, DP when i get them? I looked at the HKS UP on ebay, and the pic they took shows gaskets with the UP, does it come with it?
Subaru Exhaust Gasket Package

All the gaskets you need to install the UP and DP are in there.

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post #14 of 22 Old 01-25-2008, 06:09 PM Thread Starter
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alright thanks. and thanks for the gasket link. They should sell the gaskets with the UP and DP though. kinda ### you gota get em seperately... but w.e

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post #15 of 22 Old 01-25-2008, 06:14 PM
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alright thanks. and thanks for the gasket link. They should sell the gaskets with the UP and DP though. kinda ### you gota get em seperately... but w.e
You can buy them sepately but it is easiest to drop the exhaust manifold when you swap the UP. In there you have the head to manifold, manifold to UP, UP to turbo, turbo to DP gaskets all in the same package.

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