Divided T4 yes. Borg Warner 61mm. Never ran 20psi through it yet. Hope to cross that road in the next few months. AR is just a ratio though, so it's kind of hard to compare different manufacturers housings just by the AR number alone.
Here is old post of mine showing some back to back tests on a 2.5L Subaru I believe, comparing two different BW turbos (60mm and 63mm) with two different exhaust housings (.91 and 1.0). You can see why I chose the .91.
http://www.mitsustyle.com/forums/sho...1&postcount=62
But again, these are BW housings so not really apples to apples with PTE stuff. And remember AR is a ratio, there's more to it than just that number.
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