Simple Exhaust Questions

[vex]

I hate starting things like this but; i'll be starting my turbo 6PI build here in a few and I've been looking over exhaust components.

I only have a 2.5" T3 flange coming off of my turbo and I was playing with the thought of using stainless steel on the entire system. The problem with that is I'm not even sure it's necessary that close to the turbo (to be stainless). I was planning on using the T3 flange adapter that goes from 2.5" T3 to 3" V-Band. The only thing I have against that is that it's not stainless.

I'm also looking at the Engine to Header flange that Racing beat sells, they do not list it as either mild or stainless, but again would it matter when it's that close to the turbo?

I am planning on running 3" stainless back to the 3" stainless pre-silencer, then off the Y-pipe going to a 2.5" dual exhaust setup again with stainless.

Am I just being anal about this? Or should I really invest in trying to find some stainless steel flanges?