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Reintroducing you’re externally gated flow stream further down in the exhaust will help alleviate back pressure at the discharge of the turbo and keep things quiet.
18psi is relatively tame on that turbo. I would suggest studs and a gasket and more boost without tremendous modifications for more power. You’re already on E85. Cams will shift the powerband to the right, omitting anything the stock intake manifold adds back. I wouldn’t go more aggressive than 264’s if you do choose that route.
Ultimately, you have a lot of choices, but this is just one opinion...
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