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How important is it to get the flange on a turbocharger resurfaced when installing on a new header flange? And is red High temp rtv sufficient for sealing? Or would a gasket or copper rtv be better?

And I want to install a cat of the highest flowing capacity on my car to reduce the fumes I smell every time I drive, would this be a bad idea since I have no air pump and would ruin the cat along with the turbos high temps?

If there is a cat that would work for me, which one is it? I was looking at the magnaflow metallic spun cats.
 

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Copper rtv is your best choice. Try to give it 24hrs to cure before you run the car.

Are to talking about the t-3/t-4 style flange on the exhaust housing?

It's a rare day that it would get so warped that it wouldn't seal up.

Just call Magnaflow and see what they say about using that particular cat.
 
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