The stock gaskets are a crush type gasket, so once your torque the uppipe/manifolds on, they conform to the surface. It doesn't matter how many miles you have on the gaskets. Once they are crushed, they are used. If you reuse them they may or may not re-conform to the surface.

With that said, you need to decide if you want to replace the gaskets or reuse. I replaced all my gaskets and have had no leaks. Others have reused their gaskets with no leaks as well, but they may have been lucky.

Which gaskets you need depends on how you install the uppipe. Through the bottom method:
Bottom Uppipe Gasket: 44022AA170
Turbo Inlet Gasket: 44022AA150
Cross Pipe Gasket: 44011FA020
Exhaust Manifold Gasket: 14038AA000

Through the top method (take turbo off):
Bottom Uppipe Gasket: 44022AA170
Turbo Inlet Gasket: 44022AA150

Of course with both methods you'll need a new downpipe (turbo outlet) gasket, because either way you have to remove the DP. I personally think the "through the bottom" way is the best, because removing the turbo is a PITA.

 

I'm looking to do this tomorrow... I have both up pipe gaskets. What's so tough about removing the turbo? Seems like if you have to take the pipes off both sides and loosen the brackets anyway, it's just an oil and coolant line away from lifting it out?

Am I missing something?

 

True, it is just the oil and coolant lines. But you have to drain all of the coolant first, which makes an absolute mess (it did for me at least). And if you don't get the turbo oil drain tube put back in correctly, you could really mess up your car. I just don't like draining the coolant if I don't have to

 

So, first, we all hate it when people dont search and just post...well I searched, and searched and only managed to make the situation worse, so I apologize for wasting space.

A couple of weeks from now I am going to have my JDM STi uppipe and Bosal downpipe installed (DR might say its about F*@*ing time) and I need to know which gaskets to get for the uppipe (the downpipe came with some so no worries). The reason I post is that I've come across three seperate answers and I need to know the right one so I can order the parts on time.

1st thread said I should order 3 gaskets
For the uppipe:
Bottom Uppipe Gasket: 44022AA170
Turbo Inlet Gasket: 44022AA150
Turbo Outlet Gasket: 44022AA180

2nd link says I need only two (Its Hotdogs post)
For the uppipe:
Bottom Uppipe Gasket: 44022AA170
Turbo Inlet Gasket: 44022AA150

And last but not least, people say you can just use your OEM ones, but I have no idea how many miles you normally put on them before they break down....I currently have 15,000 miles on my car, can I get away w/ my oem ones?

Once again, sorry to put up yet another f'ing post about this, but I went through the search and found too many answers. Thanks in advance for your time.
....and of course, please feel free to flame away

What method did you use? Any problems? I have a Sti uppipe on the way, and looking to get a Bosal Downpipe in the next few weeks. Did the downpipe need a gasket as well? Since I'm going for the same setup, how do you like it? Big Difference?

 

Why would you remove the turbocharger or the exhaust manifold to install an uppipe?

 

Why would you remove the turbocharger or the exhaust manifold to install an uppipe?

The only ways to do it.

If you do it from the bottom, why to you have to remove the downpipe? Cant you just jack up the engine and remove the manifolds? Plus, cant you reuse the manifold gaskets?

 

The only ways to do it.

If you do it from the bottom, why to you have to remove the downpipe? Cant you just jack up the engine and remove the manifolds? Plus, cant you reuse the manifold gaskets?

I'd agree with you if I hadn't put mine in last Saturday without any such drama. I simply unbolted the 5 nuts and 2 bolts holding the uppipe on, jacked up the engine until there was enough room for the studs to clear the bottom of the turbo and removed the uppipe.

You have to remove the downpipe first because it covers some of the uppipe to turbo studs and nuts. I also took the uppipe out where the downpipe would normally be sitting.

I reused all three of the o.e. metal gaskets (mani to uppipe, uppipe to turbo and turbo to downpipe). They are crush type gaskets as hot dog stated. In order to keep them from leaking you simply need to crush them a bit more than Subaru did when they screwed it together the first time. Multiple reusage of the gaskets may result in a leak no matter how tight you make it, they will only crush so far. I don't know about the manifold to head gaskets, I didn't take that apart.