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.
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.
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.
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.
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.
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.
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.
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?
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.
So, i should replace all the gaskets when i do the UP and DP swap huh? just because it would be easier not to have to do it later... I'm pretty settled on the Invidia UP now, good quality for the price...
i have the HKS uppipe and it comes with one gasket where it bolts to the exaust manifold and new screws for where it bolts to the turbo. Just get the 2.2 ohm resistor and plug it into the harness to shut the CEl off. Cap off the bung for the sensor
Might as well go with Grimmspeed's port/polish of exhaust manifold elbows and their high-flow crosspipe since your removing the manifold anyway! Do it all at once, since its gonna be part of the labor.
Quote:
Originally Posted by Boober909 View Post
oh and 3 inch is good but i don't think it matters a huge bunch.
FYI, people have made 800whp on a 2.25" uppipe and it wasn't a restriction.
And for that matter...a 2.25" inlet uppipe is pretty big (bigger than HKS/helix/BPM etc)....so I would sure hope it's not a restriction!
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