Im trying to buy a tial mv-s 38 mm. Im not sure which to buy as far as how many bar or psi though... is dependant on how much boost im pushing?

And also, since its v-band, will it work with my 2 bolt manifold? Im confused about that whole part of it. This is my first turbo install. Thank you.

 

No. The MVS will not work with the traditional 2 bolt flange of your manifold. If its part of a cast manifold, you may need to either get another manifold or an adapter flange. You typically get the spring that is just under the PSI that you plan to run for a given turbocharger. You should know what size turbocharger and pressure you need by now.