[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.

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.

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.