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Originally Posted by classicauto
I would run a little smaller primaries personally, something in the 1.75" flavour. 2" is pretty large, but it shouldn't hurt that much.
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A little too late now though. I already picked up the materials for it. Honestly I don't think the exhaust gas flow will slow down that much compared to the two, but I may be mistaken. A change in area of less than 1 sq in isn't all that big.
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As far as interfering with your actuators, without really holding it up I'd have to go by what you're saying, but I really think you'd benefit in the boost control department from locating them closer to the turbine. Even if the height from the primaries didn't change, but you just rotated the runners 90* to face the primaries where they enter the turbine, you may be able to make them fit.
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I really doubt I'll be able to make them fit on the upper side of things without hitting interference from the 6PI actuators. I may be able to have enough room since they're low enough on the profile to sit on the underside of the 90* bend. Unfortunately this means that a lot of the welds would be exposed to the direct exhaust temperature. I honestly don't think that will hold up too well. Consequently the only other option would be to mount a 90* on the collector angle it directly down so it by-passes the primaries all together and then have another 90* angled towards the rear of the car. I can only think that a bad idea by the moment arm placed on the manifold. There's suddenly independent primaries without the additional bracing that the wastegate runners provided before. Though it may be asinine to worry about since the primaries are so thick.
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I wouldn't think you'll need much bracing, that manifold is pretty short, and with some heavy wall stainless it will be pretty damn stout.
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I picked up mild, and should still be as stout. The stainless pieces I was looking at were about 2 to 3 times as expensive. A little out of the price range of this build.