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Take a look at this guide:

https://www.evolutionm.net/forums/ev...sing-pics.html

I do not know the specific name of the gasket but it goes between your o2 housing(megan racing piece) and your hotside (rusty cast iron piece)

Having done that install a couple of times I strongly recommend removing the radiator and splitting the hotside from the turbo to get it out

 

if you invest in the correct wrenches you wont have a problem with that last one and can be done without taking anything out. ill look for a pic of the wrenches im talkin bout

 

o2 housing gasket = MR299686

o2 housing bolts MD062961 = uses 3 of these

o2 housing studs MR224441 = uses 2 of these

nut for studs MD050073 = uses 2 of these

washers for studs MD132933 = entire turbo area turbine housing area uses 9 of these but the o2 housing area only uses 5.

 

Great info. Nice to know when Im doing my o2 housing swap

 

Shouldnt be a problem if you have the right tools. Use a universal joint with the socket and you should be fine. Try to do it from underneath the car.