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Lot of $$$ for not alot of gain. By the time you invest in it, you could buy a properly tuned (runner length and volume) manifold.
Remember, turbo cars do not depend as much on manifold design as NA cars since they are just ramming air in. They more care about volume and having a reservoir to store that volume of air since it is now compressed and you can fit more "air" mass for a specific volume than if you were NA
TL.DR just buy a proper manifold and not waste your time. I don't think (not confirmed) the stock plenum volume is even 2 liters (the size of the engine and the minimal you want chamber volume to be)
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