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I believe the Pentroof (or is it Ab Flug) manifolds are made to order. So if you were to buy them for the PE1420 turbos, they would be made without external wastegate flanges. But I would rather drop ~$1800 for nearly indestructable, good flowing, stock bolt up inconel Specialty-Z manifolds over the larger Pentroof tubular manifolds that cost a few hundred more. The 5-bolt downpipes wouldn't bolt up with them, as well as the other compressor piping. So in the end it would cost more than a few hundred dollars more to get the Pentroofs to work, and you wouldn't have that reassurance that they would not crack (even though all the Pentroofs I have seen at this point have held up).
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