psi shouldnt limit you, stay under 275whp and always use 93 octane. get professionally tuned and it shouldnt be an issue. those itr pistons are known for having slightly weaker ringlands though, so be careful. gl with the build. and btw, you either have a t3 or t4 flange, not both. the turbine housing mounts to your manifold, which is normally the smaller. in your hybrid t3/t4 turbo's, the t3 is the side that will bolt to your manifold. a straight t4 is immensly too large for a stock motor.