I doubt the Evo x manifold will be flanged for the T-25. I pray it is not a megan racing or similar brand manifold. Just get an Evo X stock turbo unless the manifold is flanged for a T3.
11.5:1 compression + boost on pump gas = YOU as a driver need to be REALLY careful and have a REALLY good tuner. Your gas station also needs to NEVER give you a bad batch of gas. Apexi does a 1.8mm head gasket that drops the compression ratio to 10.3:1 Be wary of running a water injection tune all the time. There will be a point where you will run out of water no matter how careful you are about filling it up. If the AEM has a map switching ability then it's not so bad.